Leeming, Glenda
Published for the British Council, 1972
Buku Teks
Trilling, Lionel
Meridian Books, 1955
Buku Teks
Arnold, Alvin L.
John Wiley & Sons, 1993
Buku Referensi
Arnold, Thurman Wesley
New Haven Yale University Press 1937,
Buku Teks
Arnold, John
Accountancy Age Books , 1974
Buku Teks