Hans Joachim Alpers (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hans Joachim Alpers" in English language version.

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books.google.com

Sullivan, Charles William (20 September 1999). Young Adult Science Fiction. Greenwood Press. ISBN 9780313289408 – via Google Books.

GmbH, BuchMarkt Verlag K. Werner. "Hans-Joachim Alpers - BuchMarkt". www.buchmarkt.de. Archived from the original on 2016-03-10. Retrieved 2014-09-23.

"Alpers, Hans Joachim". Encyclopedia of Science Fiction. Retrieved 13 October 2011.

GmbH, BuchMarkt Verlag K. Werner. "Hans-Joachim Alpers - BuchMarkt". www.buchmarkt.de. Archived from the original on 2016-03-10. Retrieved 2014-09-23.