APA

Graves H. B., . (1947). The mineral key. New York: McGraw-Hill.

Chicago

Graves Howard B, . 1947. The mineral key. New York: McGraw-Hill.

Harvard

Graves H. B., . (1947). The mineral key. New York: McGraw-Hill.

MLA

Graves Howard B, . The mineral key. New York: McGraw-Hill. 1947.