APA

Pearl R. M., . (1955). How to know the minerals and rocks. New York: McGraw-Hill.

Chicago

Pearl Richard Maxwell, . 1955. How to know the minerals and rocks. New York: McGraw-Hill.

Harvard

Pearl R. M., . (1955). How to know the minerals and rocks. New York: McGraw-Hill.

MLA

Pearl Richard Maxwell, . How to know the minerals and rocks. New York: McGraw-Hill. 1955.