Gaya APA
Rangkuty, F. (2010).
Spiritual Leadership in Business WAKE UP! " Khoirunnas anfauhum Linnas" .
Jakarta:
Gramedia pustaka utama.
Gaya MLA
Rangkuty, Freddy.
"Spiritual Leadership in Business WAKE UP! " Khoirunnas anfauhum Linnas"".
Jakarta:
Gramedia pustaka utama,
2010.
Text.