Gaya APA
Hero, S, Z, T., SPS, K, P, H.
(2010).
Spiritual Problem Solving
.
yogjakarta:
Pro-U Media.
Gaya MLA
Hero, Solikhin, Zero, To., SPS, Kang, Puji, Hartono,.
"Spiritual Problem Solving".
yogjakarta:
Pro-U Media,
2010.
Buku Pengayaan.