Valdez, L. S. (1988). Vocational preferences of the senior high school students of Filipinas National High School, San Nicolas, Ilocos Norte school year, 1987-1988.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিValdez, Leonardo Santos. Vocational Preferences of the Senior High School Students of Filipinas National High School, San Nicolas, Ilocos Norte School Year, 1987-1988. 1988.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিValdez, Leonardo Santos. Vocational Preferences of the Senior High School Students of Filipinas National High School, San Nicolas, Ilocos Norte School Year, 1987-1988. 1988.
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