Baver, L.D. (Leonard David), 1901-
Soil physics
John Wiley & Sons, 1972
Buku Teks
Sulman, Elizabeth
Introduction to soil
Prentice-Hall, 1999
Buku Teks
Characteristics of composted bio-toilet residue and its potential use as a soil conditioner
Artikel Jurnal
Keller, Frederick J., 1934-
Physics
McGraw-Hill, 1993
Buku Teks
Giancoli, Douglas C.
Physics
Prentice-Hall, 1998
Buku Teks