Gaya APA

Scholz, U. (1983). The natural regions of Sumatera and their agricultural production pattern ; a regional analysis . Bogor: Central Reserch Institute for Food Grops.

Gaya MLA

Scholz, Ulrich. "The natural regions of Sumatera and their agricultural production pattern ; a regional analysis". Bogor: Central Reserch Institute for Food Grops, 1983. Text.