Gaya APA
Oldroyd, D, R. (1996).
Thingking about the earth: a history of ideas in geology .
Reading, Mas.:
Pustaka Sinar Harapan.
Gaya MLA
Oldroyd, David, R..
"Thingking about the earth: a history of ideas in geology".
Reading, Mas.:
Pustaka Sinar Harapan,
1996.
Textbook.