Sobary, M. (1999). Piety and Economics Behavior A Study of The Informal Sector in Surabya, West Java = Kesalehan dan Tingkah Laku Ekonomi. Yayasan Bentang Budaya.
Chicago Style aipamenaSobary, Mohamad. Piety and Economics Behavior A Study of The Informal Sector in Surabya, West Java = Kesalehan Dan Tingkah Laku Ekonomi. Yayasan Bentang Budaya, 1999.
MLA aipamenaSobary, Mohamad. Piety and Economics Behavior A Study of The Informal Sector in Surabya, West Java = Kesalehan Dan Tingkah Laku Ekonomi. Yayasan Bentang Budaya, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.