Citazione Stile APA (7a Edizione)

Ostrowski, R., & Kemper, J. (1977). Echoes of time: A world history. MacGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Ostrowski, Richard, e Jack Kemper. Echoes of Time: A World History. New York [u.a.]: MacGraw-Hill, 1977.

Citatione MLA (9a ed.)

Ostrowski, Richard, e Jack Kemper. Echoes of Time: A World History. MacGraw-Hill, 1977.