Gaya APA
Williams, H. (1958).
Petrography : An Introduction to the Study of Rocks in Thin Sections .
San Francisco:
W.H. FREEMAN AND COMPANY.
Gaya MLA
Williams, Howell.
"Petrography : An Introduction to the Study of Rocks in Thin Sections".
San Francisco:
W.H. FREEMAN AND COMPANY,
1958.
Text.