APA aipamena

Ratzel,, . F. (1989). History of mankind: Vol.2. Radha Publication.

Chicago Style aipamena

Ratzel,, Friedrich. History of Mankind: Vol.2. Delhi: Radha Publication, 1989.

MLA aipamena

Ratzel,, Friedrich. History of Mankind: Vol.2. Radha Publication, 1989.