Laws, Edward A., author
John Wiley & Sons, 1981
Buku Teks
Laws, Edward A., author
John Wiley & Sons, 2000
Buku Teks
edited by Levern J. Weber
Raven Press, 1992
Buku Teks
edited by Timothy E. Ford
Blackwell, 1993
Buku Teks
edited by R.S.K. Barnes and K.H. Mann
Blackwell, 1991
Buku Teks