APA (7e ed.) Bronvermelding

Ibarra, M. C. A., Leung, M. F. P., & Magpili, L. M. M. (1992). A Work study on Playpen Export Philippines. College of Engineering.

Chicago (17e ed.) Bronvermelding

Ibarra, Ma. Celeste A., Ma. Felicia P. Leung, en Luna Mylene M. Magpili. A Work Study on Playpen Export Philippines. Diliman, Quezon City: College of Engineering, 1992.

MLA (9e ed.) Bronvermelding

Ibarra, Ma. Celeste A., et al. A Work Study on Playpen Export Philippines. College of Engineering, 1992.