Gaya APA

Muller, P, O., J., D, B, H. (1988). Geography : regions and concepts (5th edition). New York: John Wiley & Sons.

Gaya MLA

Muller, Peter, O.., J., De, Blij,, Harm. "Geography : regions and concepts". 5th edition New York: John Wiley & Sons, 1988. BUKU.