APA (7e ed.) Bronvermelding

RAY, S. (2014). OUR EARTH: A BOOK OF GEOGRAPHY - 4. FRANK EDUCATIONAL AIDS.

Chicago (17e ed.) Bronvermelding

RAY, SUMITRA. OUR EARTH: A BOOK OF GEOGRAPHY - 4. FRANK EDUCATIONAL AIDS, 2014.

MLA (9e ed.) Bronvermelding

RAY, SUMITRA. OUR EARTH: A BOOK OF GEOGRAPHY - 4. FRANK EDUCATIONAL AIDS, 2014.

Let op: Deze citaties zijn niet altijd 100% accuraat.