Timeline of Aachen (English Wikipedia)

Freundeskreis Botanischer Garten Aachen (2000). "Die Eröffnung des Karlsgartens" (in German). BIOZAC – BIOlogisches Zentrum AAChen. Retrieved 8 December 2013.

books.google.com (Global: 3^rd place; English: 3^rd place)

Hermann Tallau (2008). "Alteste (100) Schützenvereinigungen 799-1392". Ein Kaleidoskop zum Schützenwesen (in German). Duderstadt: Mecke Druck und Verlag. ISBN 978-3-936617-85-6.
Allgemeines Adreßbuch für den deutschen Buchhandel ... 1870 (in German). Leipzig: O.A. Schulz. 1870.
Vernon N. Kisling, ed. (2000). "Zoos and Aquariums of the World (chronological list)". Zoo and Aquarium History. USA: CRC Press. ISBN 978-1-4200-3924-5.
Ossama Hegazy (2015). "Towards a German Mosque". In Erkan Toğuşlu (ed.). Everyday Life Practices of Muslims in Europe. Leuven University Press. pp. 193–216. ISBN 978-94-6270-032-1.

bundesarchiv.de (Global: 4,833^rd place; English: 8,339^th place)

"Arbeitserziehungslager Aachen-Burtscheid". Bundesarchiv.de (in German). Retrieved 20 August 2022.

cinematreasures.org (Global: low place; English: 5,650^th place)

"Movie Theaters in Aachen, Germany". CinemaTreasures.org. Los Angeles: Cinema Treasures LLC. Retrieved 8 December 2013.

citymayors.com (Global: 7,037^th place; English: 7,671^st place)

"German mayors". City Mayors.com. London: City Mayors Foundation. Retrieved 8 December 2013.

doi.org (Global: 2^nd place; English: 2^nd place)

"Chambers's Encyclopaedia". Nature. 44 (1130): 173. 1891. Bibcode:1891Natur..44R.173.. doi:10.1038/044173c0.

handle.net (Global: 102^nd place; English: 76^th place)

hdl.handle.net

"Aix-la-Chapelle". Galignani's Traveller's Guide through Holland and Belgium (4th ed.). Paris: A. and W. Galignani. 1822. hdl:2027/njp.32101073846667.
Benjamin Vincent (1910), "Aix-la-Chappelle", Haydn's Dictionary of Dates (25th ed.), London: Ward, Lock & Co., hdl:2027/loc.ark:/13960/t89g6g776 – via Hathi Trust
William Henry Overall, ed. (1870). "Aix-la-Chappelle". Dictionary of Chronology. London: William Tegg. hdl:2027/uc2.ark:/13960/t9m32q949.
Brockhaus 1896. "Aachen". Brockhaus' Konversations-Lexikon (in German) (14th ed.). Leipzig: Brockhaus. 1896. hdl:2027/njp.32101064064429.
"Germany: Principal Towns". Statesman's Year-Book. London: Macmillan and Co. 1921. hdl:2027/njp.32101072368440 – via Hathi Trust.

harvard.edu (Global: 18^th place; English: 17^th place)

ui.adsabs.harvard.edu

"Chambers's Encyclopaedia". Nature. 44 (1130): 173. 1891. Bibcode:1891Natur..44R.173.. doi:10.1038/044173c0.

katolsk.no (Global: low place; English: low place)

"Chronology of Catholic Dioceses: Germany". Norway: Oslo katolske bispedømme (Oslo Catholic Diocese). Retrieved 30 June 2015.

newmuseum.org (Global: low place; English: low place)

"Germany". Art Spaces Directory. New York: New Museum. Retrieved 8 December 2013.

wikisource.org (Global: 27^th place; English: 51^st place)

en.wikisource.org

Chisholm, Hugh, ed. (1911). "Aix-la-Chapelle" . Encyclopædia Britannica. Vol. 1 (11th ed.). Cambridge University Press. pp. 448–449.

Timeline of Aachen (English Wikipedia)

archive.org (Global: 6th place; English: 6th place)

baukunst-nrw.de (Global: low place; English: low place)

biozac.de (Global: low place; English: low place)

books.google.com (Global: 3rd place; English: 3rd place)

bundesarchiv.de (Global: 4,833rd place; English: 8,339th place)

cinematreasures.org (Global: low place; English: 5,650th place)

citymayors.com (Global: 7,037th place; English: 7,671st place)

doi.org (Global: 2nd place; English: 2nd place)

handle.net (Global: 102nd place; English: 76th place)

hdl.handle.net

harvard.edu (Global: 18th place; English: 17th place)

ui.adsabs.harvard.edu

katolsk.no (Global: low place; English: low place)

newmuseum.org (Global: low place; English: low place)

wikisource.org (Global: 27th place; English: 51st place)

en.wikisource.org

archive.org (Global: 6^th place; English: 6^th place)

books.google.com (Global: 3^rd place; English: 3^rd place)

bundesarchiv.de (Global: 4,833^rd place; English: 8,339^th place)

cinematreasures.org (Global: low place; English: 5,650^th place)

citymayors.com (Global: 7,037^th place; English: 7,671^st place)

doi.org (Global: 2^nd place; English: 2^nd place)

handle.net (Global: 102^nd place; English: 76^th place)

harvard.edu (Global: 18^th place; English: 17^th place)

wikisource.org (Global: 27^th place; English: 51^st place)