Preston, Lee E., author
IBER (Institute of Business and Economic Research), 1966
Buku Teks
Lehmann, Donald R., author
Topan, 1989
Buku Teks
Lehmann, Donald R., author
Richard D. Irwin, 1989
Buku Teks
Lehmann, Donald R., author
Richard D. Irwin, 1979
Buku Teks
Adler, Max K., author
Crosby Lockwood & Sons, 1965
Buku Teks