APA

Kehl G. L., . (1949). The principles of metallographic laboratory practice. New York: McGraw-Hill.

Chicago

Kehl George L, . 1949. The principles of metallographic laboratory practice. New York: McGraw-Hill.

Harvard

Kehl G. L., . (1949). The principles of metallographic laboratory practice. New York: McGraw-Hill.

MLA

Kehl George L, . The principles of metallographic laboratory practice. New York: McGraw-Hill. 1949.