APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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