Cita APA (7th ed.)

Cruz, A. A., Hidalgo, N. P., & Santos, H. H. (1987). A survey of SDI services in selected special libraries and information centers in Metro Manila.

Cita Chicago (17th ed.)

Cruz, Aida A., Namnama P. Hidalgo, i Herminia H. Santos. A Survey of SDI Services in Selected Special Libraries and Information Centers in Metro Manila. Quezon City : Institute of Library Science, University of the Philippines Diliman, 1987.

Cita MLA (9th ed.)

Cruz, Aida A., et al. A Survey of SDI Services in Selected Special Libraries and Information Centers in Metro Manila. 1987.