Gaya APA

WILLIAMS,Howel, . (1954). PETROGRAPHY An Introduction to the Study of Rocks in Thin Sections . America: W.H.FREEMAN AND COMPANY.

Gaya MLA

WILLIAMS,Howel, . "PETROGRAPHY An Introduction to the Study of Rocks in Thin Sections". America: W.H.FREEMAN AND COMPANY, 1954. Text.