APA-referens (7:e uppl.)

de la Torre, V. R. (1988). Business and professionals (1988-89 ed.). New Info Corporation.

Chicago-referens (17:e uppl.)

de la Torre, Visitacion R. Business and Professionals. 1988-89 ed. [Manila]: New Info Corporation, 1988.

MLA-referens (9:e uppl.)

de la Torre, Visitacion R. Business and Professionals. 1988-89 ed. New Info Corporation, 1988.