Boer, H. d. (1998). Coffee cultivation in the watershed of the river Aranjuez.
Citación estilo ChicagoBoer, H. den. Coffee Cultivation in the Watershed of the River Aranjuez. 1998.
MLA引文Boer, H. den. Coffee Cultivation in the Watershed of the River Aranjuez. 1998.
警告：這些引文格式不一定是100％准確.