Serra, Michael
Key Curriculum Press , 1993
Buku Teks
Lathrop, Thomas G., author
Wadsworth, 1967
Buku Teks
Robson, B.N., author
Rigby, 1968
Buku Teks
Smart, James R., author
Brooks/Cole Publishing, 1969
Buku Teks
Stubblefield, Beauregard, author
California Brooks, 1969
Buku Teks