APA

Pearl R. M., . (1951). Guide to geologic literature. New York: McGraw-Hill.

Chicago

Pearl Richard M, . 1951. Guide to geologic literature. New York: McGraw-Hill.

Harvard

Pearl R. M., . (1951). Guide to geologic literature. New York: McGraw-Hill.

MLA

Pearl Richard M, . Guide to geologic literature. New York: McGraw-Hill. 1951.