APA aipamena

Unnikrishnan Puthoor. (1969). Chatuppu Nilam. Sahitya Pravarthaka Co-operative Society Ltd.

Chicago Style aipamena

Unnikrishnan Puthoor. Chatuppu Nilam. Koottayam: Sahitya Pravarthaka Co-operative Society Ltd, 1969.

MLA aipamena

Unnikrishnan Puthoor. Chatuppu Nilam. Sahitya Pravarthaka Co-operative Society Ltd, 1969.