Citazione Stile APA (7a Edizione)

Wells, A. K., & Kirkaldy, J. F. (1966). Outline of historical geology (5th revised ed. (6th impression).). Murby.

Citazione stile Chigago Style (17a edizione)

Wells, Alfred Kingsley, e John Francis Kirkaldy. Outline of Historical Geology. 5th revised ed. (6th impression). London: Murby, 1966.

Citatione MLA (8a ed.)

Wells, Alfred Kingsley, e John Francis Kirkaldy. Outline of Historical Geology. 5th revised ed. (6th impression). Murby, 1966.