Citazione Stile APA (7a Edizione)

Singson, A. B. (1973). Instructional materials in teaching English verb tenses and aspects to Ilocano learners. [s.n.].

Citazione stile Chigago Style (17a edizione)

Singson, Antonia B. Instructional Materials in Teaching English Verb Tenses and Aspects to Ilocano Learners. Quezon City: [s.n.], 1973.

Citatione MLA (9a ed.)

Singson, Antonia B. Instructional Materials in Teaching English Verb Tenses and Aspects to Ilocano Learners. [s.n.], 1973.