Terry, George R.
Richard D. Irwin, 1975
Buku Teks
Littlefield, C.L.
Prentice-Hall, 1971
Buku Teks SO
Leffingwell, William Henry
McGraw-Hill , 1950
Buku Teks
Littlefield, C.L.
Prentice-Hall, 1956
Buku Teks
Wylie, Herry L.
Prentice-Hall, 1961
Buku Teks