Gaya APA

Somerton, W, H. (1970). Rock Mechanics-Theory and Practice Eleventh Symposium on Rock Mechanics . United States of America: The American Inst.of Mining..

Gaya MLA

Somerton, Wilbur, H.. "Rock Mechanics-Theory and Practice Eleventh Symposium on Rock Mechanics". United States of America: The American Inst.of Mining., 1970. Text.