APA (7e ed.) Bronvermelding

Borlaza, C., Mejia, J., & Sarabia, A. (1991). A Systems study of R.A. hats. College of Engineering.

Chicago (17e ed.) Bronvermelding

Borlaza, Carlo, Jonstein Mejia, en Allan Sarabia. A Systems Study of R.A. Hats. Diliman, Quezon City: College of Engineering, 1991.

MLA (9e ed.) Bronvermelding

Borlaza, Carlo, et al. A Systems Study of R.A. Hats. College of Engineering, 1991.