APA

Willis B., Willis R., . (1934). Geologic structures. New York: McGraw-Hill.

Chicago

Willis Bailey, Willis Robin, . 1934. Geologic structures. New York: McGraw-Hill.

Harvard

Willis B., Willis R., . (1934). Geologic structures. New York: McGraw-Hill.

MLA

Willis Bailey, Willis Robin, . Geologic structures. New York: McGraw-Hill. 1934.