Spotts, Merhyle Franklin
Prentice-Hall, 1971
Buku Teks
Spotts, Merhyle Franklin
Prentice-Hall, 1985
Buku Teks
Bhandari, V. B.
Tata McGraw-Hill, 2010
Buku Teks
Faires, Virgil Moring
Macmillan, 1965
Buku Teks
Movnin, M.
Moscow: Mir Publishers, 1975
Buku Teks