Gaya APA
Elfiky, D, I.
(2010).
Terapi Positive Thinking
(
1)
.
Yogyakarta:
Hikam Pustaka.
Gaya MLA
Elfiky, Dr., Ibrahim.
"Terapi Positive Thinking".
1
Yogyakarta:
Hikam Pustaka,
2010.
buku.