Castro, R. (1980). "This is my life": Once a teacher, always a teacher. M. & L Licudine Enterprises.
Chicago-referens (17:e uppl.)Castro, Ricardo. "This Is My Life": Once a Teacher, Always a Teacher. Quirino Ave.,[Manila]: M. & L Licudine Enterprises, 1980.
MLA-referens (9:e uppl.)Castro, Ricardo. "This Is My Life": Once a Teacher, Always a Teacher. M. & L Licudine Enterprises, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.