Gaya APA

Hutchinson, R, E, A. (1987). Economic Geology: Bulletin of the Society of Economic Geologists (1). United States of America: Bulletin of the Society of Economic Geologists.

Gaya MLA

Hutchinson, R.W, Et, Al.. "Economic Geology: Bulletin of the Society of Economic Geologists". 1 United States of America: Bulletin of the Society of Economic Geologists, 1987. Text.