Edson, Gary, author
Routledge, 1996
Buku Referensi
Hedgecoe, John, author
Ebury, 1992
Buku Referensi
Skousen, Philip L., author
McGraw-Hill, 2011
Buku Teks
edited by E.U. Condon and Hugh Odishaw
McGraw-Hill, 1967
Buku Referensi
edited by E.U. Condon and Hugh Odishaw
McGraw-Hill, 1958
Buku Referensi