Gaya APA

Dinwiddie, D., MacHall, R. (1978). POPULAR MECHANICS COMPLETE BOOK OF ROCKS MINERALS GEMS FOSSILS . United States of America: Popular Mechanics.

Gaya MLA

Dinwiddie, Donal., MacHall, Rusell. "POPULAR MECHANICS COMPLETE BOOK OF ROCKS MINERALS GEMS FOSSILS". United States of America: Popular Mechanics, 1978. Text.