Cita APA (7th ed.)

Fernando, G. C., & Aragon, G. (1998). Mr. Ulcer. GCF Books.

Cita Chicago (17th ed.)

Fernando, Gilda Cordero, i Girlie Aragon. Mr. Ulcer. Quezon City: GCF Books, 1998.

Cita MLA (9th ed.)

Fernando, Gilda Cordero, i Girlie Aragon. Mr. Ulcer. GCF Books, 1998.