Gaya APA
Bolles, R, N.
(1992).
The 1992 : what color is your parachute ?
.
California:
Ten Seed Press.
Gaya MLA
Bolles, Richard, Nelson.
"The 1992 : what color is your parachute ?".
California:
Ten Seed Press,
1992.
Buku/Printed Material.