Παραπομπή APA

Sen, R. K. Environmental problems and challenges: Recent issues and opportunities : a festschrift for Professor Raj Kumar Sen.

Παραπομπή Chicago Style

Sen, Raj Kumar. Environmental Problems and Challenges: Recent Issues and Opportunities : A Festschrift for Professor Raj Kumar Sen.

Παραπομπή MLA

Sen, Raj Kumar. Environmental Problems and Challenges: Recent Issues and Opportunities : A Festschrift for Professor Raj Kumar Sen.