by Eugene W. Nester ... [et. al.]
Holt, Rinehart and Winston, 1973
Buku Teks
Linton, Alan H.
John Wiley & Sons, 1982
Buku Teks
Black, Jaquelyn G.
John Wiley & Sons, 2008
Buku Teks
Stanier, Roger Y.
Prentice-Hall, 1963
Buku Teks
Burrows, William E.
W.B. Saunders, 1959
Buku Teks