Gaya APA
English 900 : English Language Service. (1973).
New York:
[s.n.].
Gaya Chicago
English 900 : English Language Service.
.
New York:
[s.n.],
1973.
Text.
Gaya MLA
English 900 : English Language Service.
.
New York:
[s.n.],
1973.
Text.
Gaya Turabian
English 900 : English Language Service.
New York:
[s.n.],
1973.
Print.