Gaya APA

BRADY, N, C. et al (2004). Elements of the nature and properties of soils (2nd ed.). New Jersey: Pearson Prentice Hall.

Gaya MLA

BRADY, Nyle, C.. et al. "Elements of the nature and properties of soils". 2nd ed. New Jersey: Pearson Prentice Hall, 2004. Buku.