APA-referens (7:e uppl.)

Pena, N. (1986). Credit transactions (1986 rev. ed.). Rex Book Store.

Chicago-referens (17:e uppl.)

Pena, Narciso. Credit Transactions. 1986 rev. ed. Manila: Rex Book Store, 1986.

MLA-referens (9:e uppl.)

Pena, Narciso. Credit Transactions. 1986 rev. ed. Rex Book Store, 1986.