Ryder, Frank Raymond, author
Penguin Books, 1970
Buku Teks
Peters, Ellen A., author
Bobbs-Merrill, 1974
Buku Teks
Jacobs, Bertram, author
Sweet and Maxwell, 1943
Buku Teks
Nickles, Steve H., author
West Publishing, 1993
Buku Teks
Soe, Myint, author
Quins PTE, 1977
Buku Teks