Kreps, E. H. (1910). Camp and trail methods: Interesting information for all lovers of nature, what to take and what to do. Harding.
Chicago-referens (17:e uppl.)Kreps, Elmer Harry. Camp and Trail Methods: Interesting Information for All Lovers of Nature, What to Take and What to Do. Columbus, Ohio: Harding, 1910.
MLA-referens (8:e uppl.)Kreps, Elmer Harry. Camp and Trail Methods: Interesting Information for All Lovers of Nature, What to Take and What to Do. Harding, 1910.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.