Guzman, M. K., Alcantara, R. G., Arinto, P. B., Barrios, E. B., Malicsi. Jonathan C., Ocampo, N. S., & Marcial, M. C. D. (1998). Living language: Assessment of language proficiency and needs in the professions and in the workplace. Office of Research Coordination, University of the Philippines.

Guzman, Maybelle Koch, Ruby G. Alcantara, Patricia B. Arinto, Erniel B. Barrios, Malicsi. Jonathan C., Nilo S. Ocampo, agus Ma. Corazon DP Marcial. Living Language: Assessment of Language Proficiency and Needs in the Professions and in the Workplace. Quezon City: Office of Research Coordination, University of the Philippines, 1998.

Guzman, Maybelle Koch, et al. Living Language: Assessment of Language Proficiency and Needs in the Professions and in the Workplace. Office of Research Coordination, University of the Philippines, 1998.