Mikesell, R.M.
Lembaga Penerbit FEUI, 1969
Buku Teks
Street, H.
Cambridge University Press, 1953
Buku Teks
edited by Stewart E. Fraser
John Wiley & Sons, 1965
Buku Teks SO
Thumm, Garold W.
Buku Teks
Warren, Carl S.
South-Western College, 1999
Buku Teks