by Martha Dallmann ... [et al.]
Holt, Rinehart and Winston, 1982
Buku Teks
Capron, H.L.
The Benjamin / Cumming Publishing Company Inc., 1989
Buku Teks
Tower, Ralph B.
Prentice-Hall, 1991
Buku Teks
McCormick, Kathleen A.
Manchester University Press, 1994
Buku Teks
Tinker, Miles A.
Appleton-Century-Crofts, 1962
Buku Teks