Gaya APA
Raygor, Alton L. (1970).
System for study .
Amerika:
McGraw-Hill book Company.
Gaya Chicago
Raygor, Alton L.
System for study.
Amerika:
McGraw-Hill book Company,
1970.
Text.
Gaya MLA
Raygor, Alton L.
System for study.
Amerika:
McGraw-Hill book Company,
1970.
Text.
Gaya Turabian
Raygor, Alton L.
System for study.
Amerika:
McGraw-Hill book Company,
1970.
Print.