Helios AG (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helios AG" in English language version.

refsWebsite

Global rank English rank

2books.google.com

3^rd place

3^rd place

1atlasobscura.com

1,661^st place

975^th place

atlasobscura.com

"Helios Lighthouse". Atlas Obscura. Retrieved 2024-05-04.

books.google.com

Heerding, A. (1988). The History of N. V. Philips' Gloeilampenfabrieken: Volume 2, A Company of Many Parts. CUP Archive. ISBN 978-0-521-32170-9.
Pohl, Hans (1997). Competition and Cooperation of Enterprises on National and International Markets (19th-20th Century). Franz Steiner Verlag. ISBN 978-3-515-07142-0.