Martin, E. Wainright
Illinois: Richard D Irwin, 1969
Buku Teks
Nargis Riana, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1991
UI - Skripsi (Membership)
Lane, Bennie R.
Prindle, Weber and Schmidt , 1973
Buku Teks
Kovacic, Michael L.
Prindle, Weber and Schmidt , 1971
Buku Teks
Olmsted, John M. H.
Appleton-Century-Crofts, 1968
Buku Teks