Gaya APA

Harker, A. (1939). Metamorphism : a Study of the Transformations of Rock Masses . New York: E. P. Dutton & Co. , Inc..

Gaya MLA

Harker, Alfred.. "Metamorphism : a Study of the Transformations of Rock Masses". New York: E. P. Dutton & Co. , Inc., 1939. Text.