APA-referens (7:e uppl.)

Abrina, J. J., Aspra, E., & Mapue, M. C. (1994). Garahe Leathercraft: A production systems study. College of Engineering.

Chicago-referens (17:e uppl.)

Abrina, Juan Jr, Edilynn Aspra, och Ma. Concepcion Mapue. Garahe Leathercraft: A Production Systems Study. Diliman, Quezon City: College of Engineering, 1994.

MLA-referens (9:e uppl.)

Abrina, Juan Jr, et al. Garahe Leathercraft: A Production Systems Study. College of Engineering, 1994.