Cita APA (7th ed.)

Sharma, O. P. (2012). Pteridophyta (2nd ed.). McGraw Hill Education (India).

Cita Chicago (17th ed.)

Sharma, O. P. Pteridophyta. 2nd ed. New Delhi: McGraw Hill Education (India), 2012.

Cita MLA (9th ed.)

Sharma, O. P. Pteridophyta. 2nd ed. McGraw Hill Education (India), 2012.