Gaya APA
Leedy, Paul D.. (1980).
Practical research, planning and design/ Paul D. Leedy .
Canada:
Collier Mc, Milan.
Gaya Chicago
Leedy, Paul D..
Practical research, planning and design/ Paul D. Leedy.
Canada:
Collier Mc, Milan,
1980.
.
Gaya MLA
Leedy, Paul D..
Practical research, planning and design/ Paul D. Leedy.
Canada:
Collier Mc, Milan,
1980.
.
Gaya Turabian
Leedy, Paul D..
Practical research, planning and design/ Paul D. Leedy.
Canada:
Collier Mc, Milan,
1980.
.