APA-referens (7:e uppl.)

Johnston, H., & Haden-Guest, L. H. (1924). The world of to-day: The marvels of nature and the creations of man. G.P. Putnam's Sons.

Chicago-referens (17:e uppl.)

Johnston, Harry, och Leslie Haden Haden-Guest. The World of To-day: The Marvels of Nature and the Creations of Man. New York ; London: G.P. Putnam's Sons, 1924.

MLA-referens (8:e uppl.)

Johnston, Harry, och Leslie Haden Haden-Guest. The World of To-day: The Marvels of Nature and the Creations of Man. G.P. Putnam's Sons, 1924.