Gaya APA
Blyth, F., Freitas, M, D. (1974).
A Geology for Engineers .
London, England:
The English Language Book Society.
Gaya MLA
Blyth, F.G.H.., Freitas, M.H., De.
"A Geology for Engineers".
London, England:
The English Language Book Society,
1974.
Text.