Lightstone, A. H.
Harper & Row, 1965
Buku Teks SO
Wahidin
Jakarta: Nabila Teknik Group, 1975
Buku Teks
Varberg, Dale E.
Pearson/Prentice-Hall, 2007
Buku Teks
Bartle, Robert Gardner, 1927-
Scott, Foresman, 1968
Buku Teks SO
Sherwood, G.E.F.
Prentice-Hall, 1946
Buku Teks