Welty, James R., author
Wiley, 2015
Buku Teks
by James R. Welty ... [and others]
John Wiley & Sons, 2008
Buku Teks
Welty, James R., author
John Wiley & Sons, 1976
Buku Teks
edited by Lorin R. Davis and Robert E. Wilson
Stanford University Press, 1974
Buku Teks
Erlangga, 2004
Buku Teks