Gaya APA
Dresser, Peter D., Hill, Karen Ann. (1989).
Research centers directory (13 th ed).
Detroit:
Gale Research.
Gaya Chicago
Dresser, Peter D., Hill, Karen Ann.
Research centers directory.
13 th ed
Detroit:
Gale Research,
1989.
Text.
Gaya MLA
Dresser, Peter D., Hill, Karen Ann.
Research centers directory.
13 th ed
Detroit:
Gale Research,
1989.
Text.
Gaya Turabian
Dresser, Peter D., Hill, Karen Ann.
Research centers directory.
13 th ed
Detroit:
Gale Research,
1989.
Print.