Cita APA (7th ed.)

Santiago, A. B. (1972). Programmed instruction on the present perfect tense for grade six. s.n.].

Cita Chicago (17th ed.)

Santiago, Apolonia Bermudez. Programmed Instruction on the Present Perfect Tense for Grade Six. [Quezon City: s.n.], 1972.

Cita MLA (9th ed.)

Santiago, Apolonia Bermudez. Programmed Instruction on the Present Perfect Tense for Grade Six. s.n.], 1972.