Upendra Narayan Singh. (1970). Aadhunik Hindi natakon par aangla-natakon ka prabhav. Hindi Sahitya Sansar.
Chicago Style aipamenaUpendra Narayan Singh. Aadhunik Hindi Natakon Par Aangla-natakon Ka Prabhav. Hindi Sahitya Sansar, 1970.
MLA aipamenaUpendra Narayan Singh. Aadhunik Hindi Natakon Par Aangla-natakon Ka Prabhav. Hindi Sahitya Sansar, 1970.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.