Singh, Maharaj Sawan, author
Yayasan Soami Satsang Beas Indonesia , 1998
Buku Teks
Baggini, Julian, author
Mizan Media Utama, 2004
Buku Teks
Betsy Kurniawati Witarsa, author
Fakultas Psikologi Universitas Indonesia, 2014
UI - Skripsi (Membership)
Baggini, Julian, author
Mizan Media Utama , 2004
Buku Teks
Baggini, Julian, author
Mizan Media Utama , 2004
Buku Teks