APA (7e ed.) Bronvermelding

Abrena, J. T., Ang, S. S., & Escudero, M. B. G. (1998). A Work study on Rockbuilt Steel and Metal Industrial Corporation. College of Engineering.

Chicago (17e ed.) Bronvermelding

Abrena, Jasmin T., Sheila S. Ang, en Ma. Bernadette G. Escudero. A Work Study on Rockbuilt Steel and Metal Industrial Corporation. Diliman, Quezon City: College of Engineering, 1998.

MLA (9e ed.) Bronvermelding

Abrena, Jasmin T., et al. A Work Study on Rockbuilt Steel and Metal Industrial Corporation. College of Engineering, 1998.