Press, Frank
W.H. Freeman, 1986
Buku Referensi
Wright, Samson
Oxford University Press, 1931
Buku Referensi
Heragu, Sunderesh S.
Sunderesh S., 2016
Buku Teks SO
Heragu, Sunderesh S.
Sunderesh S., 2016
Buku Teks SO
Vaughan, Tay
Osborne McGraw-Hill, 1998
Buku Referensi