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.
Čikaški stil citiranja (17. izdanje)Valdez, Leonardo Santos. Vocational Preferences of the Senior High School Students of Filipinas National High School, San Nicolas, Ilocos Norte School Year, 1987-1988. 1988.
MLA način citiranja (9. izdanje)Valdez, 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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