APA (7th ed.) Citation

Geikie, A. (1921). Class-book of geology. Macmillan and Co.

Chicago Style (17th ed.) Citation

Geikie, Archibald. Class-book of Geology. London: Macmillan and Co, 1921.

MLA (9th ed.) Citation

Geikie, Archibald. Class-book of Geology. Macmillan and Co, 1921.