Gaya APA
Powell, J. (-1976).
Mengapa takut bersikap terbuka. - Ilmu jiwa populer, 2. : Why am I afraid to tell you who I am? 1969. .
(Yogyakarta):
Yayasan CLC dsl.
Gaya MLA
Powell, John..
"Mengapa takut bersikap terbuka. - Ilmu jiwa populer, 2. : Why am I afraid to tell you who I am? 1969. ".
(Yogyakarta):
Yayasan CLC dsl,
-1976.
Buku.