Gaya APA

WOLF, B., SNYDER, G, H. (2003). Sustainable soils the place of organic matter in sustaining soils and their productivity . Bandung: Food Products.

Gaya MLA

WOLF, Benjamin., SNYDER, George, H. "Sustainable soils the place of organic matter in sustaining soils and their productivity". Bandung: Food Products, 2003. Text.