APA (7th ed.) Citation

Wells, A. K., & Kirkaldy, J. F. (1967). Outline of historical geology (6th revised ed. (7th impression).). Murby.

Chicago Style (17th ed.) Citation

Wells, A. K., and J. F. Kirkaldy. Outline of Historical Geology. 6th revised ed. (7th impression). London: Murby, 1967.

MLA (9th ed.) Citation

Wells, A. K., and J. F. Kirkaldy. Outline of Historical Geology. 6th revised ed. (7th impression). Murby, 1967.