Soni, M.L.
Delhi: Shamput Rai and Sons, 1977
Buku Teks
Johnson, James H., author
International Textbook, 1965
Buku Teks
Bolton, W. (William), 1933-, author
Longman Scientific & Technical, 1992
Buku Teks
Kasatkin, A. S. (Aleksandr Sergeevich), 1899-, author
Mir Publishers, 1970
Buku Teks
Dorf, Richard C.
CRC Press , 1993
Buku Referensi