Gaya APA

E, K, R. (2019). GOING UNDERGROUND: THE SCIENCE AND HISTORY OF FALLING THROUGH THE EARTH . : World Scientific Publishing Co.

Gaya MLA

E, KASTNER, RUTH. "GOING UNDERGROUND: THE SCIENCE AND HISTORY OF FALLING THROUGH THE EARTH". : World Scientific Publishing Co, 2019. S2-Pendidikan Bahasa Arab.