Academic Press , 1984
Buku Teks
Schubert, Leo, author
Allyn and Bacob, 1972
Buku Teks
Wisconsin American Society of Agronomy , 1965
Buku Teks
by edited by J.P. Hearn and J.K. Hodges
Clarendon Press, 1985
Buku Teks
edited by Christopher T.H. Baker, Geoffrey F. Miller
Academic Press, 1982
Buku Teks