Pearson, Frederic S., author
McGraw-Hill, 1992
Buku Teks
edited by Frank N. Magill
Fitzroy Dearborn, 1996
Buku Referensi
edited by Frank N. Magill
Fitzroy Dearborn, 1996
Buku Referensi
Reese, Trevor R.
F.W. Cheshire, 1964
Buku Teks
Simpson, W.O.
Stanley Thornes, 1988
Buku Teks