Andrews, Frank M.
University of Michigan, 1981
Buku Teks
edited by Alan Bryman, Robert G. Burgess
Routledge , 1995
Buku Teks
Markus, Gregory B.
Sage, 1979
Buku Teks
Barnett, Vic
John Wiley & Sons, 1978
Buku Teks
Deming, W. Edwards
John Wiley & Sons, 1943
Buku Teks