Choinski, John S.
Wm.C. Brown Pub., 1992
Buku Teks
Bregman, Allyn, author
John Wiley & Sons, 1990
Buku Teks
by Willis H. Johnson...[et al.]
Holt, Rinehart and Winston, 1974
Buku Teks
Watterson, Ray L., author
Burgess Publishing Comp , 1969
Buku Teks
Landa, Fred, author
Burgess, 1974
Buku Teks