Livesey, Derek L., author
Blaisdell , 1966
Buku Teks
Burcham, W.E.
Longman , 1978
Buku Teks
Cohen, Bernard Leonard, 1924-, author
Tata McGraw-Hill, 1971
Buku Teks
Enge, Harald A.
Addison-Wesley Publishing , 1966
Buku Teks
Krishnan, K. Gopala
Macmillan, 1973
Buku Teks