Gaya APA
Engel, Heinrich. (1967).
Structure System .
New York:
Van Nostrand Reinhold Company.
Gaya Chicago
Engel, Heinrich.
Structure System.
New York:
Van Nostrand Reinhold Company,
1967.
Text.
Gaya MLA
Engel, Heinrich.
Structure System.
New York:
Van Nostrand Reinhold Company,
1967.
Text.
Gaya Turabian
Engel, Heinrich.
Structure System.
New York:
Van Nostrand Reinhold Company,
1967.
Print.