Cairncross, Alec, author
Butterworth, 1960
Buku Teks
Johnson, Alvin S., author
Hearh & Co., 1911
Buku Teks
Becker, William E., author
Prentice-Hall, 1971
Buku Teks
Reynolds, Lloyd G., author
Richard D. Irwin, 1966
Buku Teks
Reynolds, Lloyd G., author
Richard D. Irwin, 1966
Buku Teks