Feenstra, H. J., & Castillo, E. S. H. (1970). Aptitude, attitude and motivation in second language acquisition: A look at two cultures. Language Study Center, Philippine Normal College.
Chicago-viite (17. p.)Feenstra, Henry J., ja Emma Santos H. Castillo. Aptitude, Attitude and Motivation in Second Language Acquisition: A Look at Two Cultures. Manila: Language Study Center, Philippine Normal College, 1970.
MLA-viite (9. p.)Feenstra, Henry J., ja Emma Santos H. Castillo. Aptitude, Attitude and Motivation in Second Language Acquisition: A Look at Two Cultures. Language Study Center, Philippine Normal College, 1970.
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