Cita APA (7th ed.)

Del Valle, G. A., Quilantang, R. J., Rosel, A. J., Hong, F. L., & Luis, P. C. (1993). The Center for research and development of volcanic materials for building.

Cita Chicago (17th ed.)

Del Valle, Glenn A., Romher J.T Quilantang, Albert J.S Rosel, Froilan L. Hong, i Prosperidad C. Luis. The Center for Research and Development of Volcanic Materials for Building. 1993.

Cita MLA (9th ed.)

Del Valle, Glenn A., et al. The Center for Research and Development of Volcanic Materials for Building. 1993.