APA

English G. L., . (1934). Getting acquainted with minerals. New York: McGraw-Hill.

Chicago

English George Letchworth, . 1934. Getting acquainted with minerals. New York: McGraw-Hill.

Harvard

English G. L., . (1934). Getting acquainted with minerals. New York: McGraw-Hill.

MLA

English George Letchworth, . Getting acquainted with minerals. New York: McGraw-Hill. 1934.