APA-referens (7:e uppl.)

De los Reyes, R. P. (1980). Communal gravity systems: Four case studies. Institute of Philippine Culture, Ateneo de Manila University.

Chicago-referens (17:e uppl.)

De los Reyes, Romana P. Communal Gravity Systems: Four Case Studies. Quezon City: Institute of Philippine Culture, Ateneo de Manila University, 1980.

MLA-referens (9:e uppl.)

De los Reyes, Romana P. Communal Gravity Systems: Four Case Studies. Institute of Philippine Culture, Ateneo de Manila University, 1980.