Mitchell, Thomas G., author
Longmans, Green, 1892
Buku Teks
edited by James C. Synder and Anthony J Catanese
McGraw-Hill, 1979
Buku Teks
van de Ven, Cornelis
Van Gorcum Assen,, 1980
Buku Teks
Ching, Frank, 1943-, author
John Wiley & Sons, Inc., 2017
Buku Teks
Raeburn, Michael, edited
Crescent Books, 1980
Buku Referensi