Gaya APA

Roberson, R, G, C. (1990). The Eastern Christian Churches: a brief survey, (rev. 3rd ed.). . Roma: Pont Inst Stud Orient.

Gaya MLA

Roberson, Ronald, G.,, CSP. "The Eastern Christian Churches: a brief survey, (rev. 3rd ed.). ". Roma: Pont Inst Stud Orient, 1990. Buku.