Gaya APA

HELMUT, H. (2021). WAVES AND RAYS IN SEISMOLOGY: ANSWERS TO UNASKED QUESTIONS (THIRD EDITION) . : World Scientific Publishing Co.

Gaya MLA

HELMUT, HABERZETTL. "WAVES AND RAYS IN SEISMOLOGY: ANSWERS TO UNASKED QUESTIONS (THIRD EDITION)". : World Scientific Publishing Co, 2021. S2-Pendidikan Bahasa Arab.