Krishna Kumar. (1992). What is worth teaching (Rev. ed.). Orient Longman.
Chicago Style aipamenaKrishna Kumar. What Is Worth Teaching. Rev. ed. Hyderabad: Orient Longman, 1992.
MLA aipamenaKrishna Kumar. What Is Worth Teaching. Rev. ed. Orient Longman, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.