Gaya APA
WILLEMS, Nicholas. (1981).
Strength of material .
New York:
McGraw-Hill.
Gaya Chicago
WILLEMS, Nicholas.
Strength of material.
New York:
McGraw-Hill,
1981.
Text.
Gaya MLA
WILLEMS, Nicholas.
Strength of material.
New York:
McGraw-Hill,
1981.
Text.
Gaya Turabian
WILLEMS, Nicholas.
Strength of material.
New York:
McGraw-Hill,
1981.
Print.