edited by Keith K. Cox
Appleton-Century-Crofts, 1967
Buku Teks
Lehmann, Donald R.
Richard D. Irwin, 1989
Buku Teks
Lehmann, Donald R.
Richard D. Irwin, 1979
Buku Teks
Lehmann, Donald R.
Topan, 1989
Buku Teks
Preston, Lee E.
IBER (Institute of Business and Economic Research), 1966
Buku Teks