Παραπομπή APA

Varma C R R. (1998). Prakrithijeevanam: Life natural (4.). State institute of languages.

Παραπομπή Chicago Style

Varma C R R. Prakrithijeevanam: Life Natural. 4. Thiruvananthapuram: State institute of languages, 1998.

Παραπομπή MLA

Varma C R R. Prakrithijeevanam: Life Natural. 4. State institute of languages, 1998.