APA

Williams R. S., Homerberg V. O., . (1939). Principles of metallography. New York: McGraw-Hill.

Chicago

Williams Robert S, Homerberg Victor O, . 1939. Principles of metallography. New York: McGraw-Hill.

Harvard

Williams R. S., Homerberg V. O., . (1939). Principles of metallography. New York: McGraw-Hill.

MLA

Williams Robert S, Homerberg Victor O, . Principles of metallography. New York: McGraw-Hill. 1939.