Sellin, Thorsten, author
Wiley Eastern Private Limited, 1970
Buku Teks
Carr, Lowell Juilliard, author
Harper & Brother , 1941
Buku Teks
Giallombardo, Rose, author
John Wiley & Sons, 1982
Buku Teks
Kaplan, Howard B., author
Sage Publications, 1984
Buku Teks
Terrance M. Brungardt
Houghton Miffiln, 1983
Buku Teks