Burrows, William E., author
W.B. Saunders, 1959
Buku Teks
Flynn, John E., author
McGraw-Hill, 1966
Buku Teks
Talaro, Kathleen Park, author
McGraw-Hill, 2012
Buku Teks
Frobisher, Martin, author
W.B. Saunders, 1957
Buku Teks
edited by F.G. Priest and I. Cam[bell
Chapman & Hall, 1996
Buku Teks