Gaya APA
S.,, L, L, W., Janes, M, F. (1961).
Concrete engineering handbook (1st ed.).
United States of America:
McGraw-Hill.
Gaya MLA
S.,, La, Londe,, William., Janes, Milo, F.,.
"Concrete engineering handbook".
1st ed.
United States of America:
McGraw-Hill,
1961.
print.