Langurayan, R. C. (1978). Cost analysis of education in the high school department of Colegio de la Purisima Concepcion, Roxas City during the school years 1975-76, 1976-77 and 1977-78. Animo Repository.

Langurayan, Rolando Conlu. Cost Analysis of Education in the High School Department of Colegio De La Purisima Concepcion, Roxas City During the School Years 1975-76, 1976-77 and 1977-78. Animo Repository, 1978.

Langurayan, Rolando Conlu. Cost Analysis of Education in the High School Department of Colegio De La Purisima Concepcion, Roxas City During the School Years 1975-76, 1976-77 and 1977-78. Animo Repository, 1978.