U 77 (Czech Wikipedia)

Analysis of information sources in references of the Wikipedia article "U 77" in Czech language version.

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u-boot-archiv.de

HOFMANN, Markus. U 77. www.u-boot-archiv.de [online]. [cit. 2023-05-10]. Dostupné online.

HELGASON, Guðmundur. List of all U-boats U-77. www.uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. Patrols by U-77. uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
Ships hit by U-77. www.uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. HMS Grove (L 77). uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. City of Perth. Uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. Wolfpack West. uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. Ships hit by this Wolfpack: Grönland. uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. Wolfpacks Kurfürst. uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. Wolfpacks Seewolf. uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. Wolfpacks Reissewolf. uboat.net [online]. [cit. 2023-05-10]. Dostupné online.
HELGASON, Guðmundur. Wolfpacks Störtebecker. uboat.net [online]. [cit. 2023-05-10]. Dostupné online.

KEMP, Paul. U-boats destroyed : German submarine losses in the World Wars. London: Arms & Armour, 1997. 288 s. Dostupné online. ISBN 1-85409-515-3, ISBN 978-1-85409-515-2. OCLC 43972253 S. 163.
GRÖNER, Erich; JUNG, Dieter; MAASS, Martin. German warships 1815-1945.. Londýn: Conway Maritime, 1991. 256 s. Dostupné online. ISBN 0-85177-593-4, ISBN 978-0-85177-593-7. OCLC 24695694
HÖGEL, Georg. Embleme, Wappen, Malings deutscher U-Boote 1939 - 1945. 5. vyd. Hamburg: Koehlers Verlagsgesellschaft mbH, 2009. 228 s. Dostupné online. ISBN 978-3-7822-1002-7, ISBN 3-7822-1002-6. OCLC 463686500 S. 51.