Gaya APA

Impe, W, E, V. (1989). Soil Improvement Techniques And Their Evolution.W. E. Van Impe (Edisi 1 Jilid 1). netherlands: BR Rotterdam, Netherland.

Gaya MLA

Impe, W., E., Van. "Soil Improvement Techniques And Their Evolution.W. E. Van Impe". Edisi 1 Jilid 1 netherlands: BR Rotterdam, Netherland, 1989. Text.