Tohutoro APA (7th ed.)

Patel, M. (1986). Progress in English (Rev.ed.). Jyoti Bindu.

Tohutoru Kātū Chicago (17th ed.)

Patel, M.S. Progress in English. Rev.ed. Nairobi: Jyoti Bindu, 1986.

Tohutoro MLA (9th ed.)

Patel, M.S. Progress in English. Rev.ed. Jyoti Bindu, 1986.