Gaya APA
Hayen, Roger L. (1985).
IFPS: an introduction. .
Virginia:
Reston Publishing.
Gaya Chicago
Hayen, Roger L.
IFPS: an introduction..
Virginia:
Reston Publishing,
1985.
Text.
Gaya MLA
Hayen, Roger L.
IFPS: an introduction..
Virginia:
Reston Publishing,
1985.
Text.
Gaya Turabian
Hayen, Roger L.
IFPS: an introduction..
Virginia:
Reston Publishing,
1985.
Print.