Rolph, Earl R.
University of California Press, 1956
Buku Teks
Rolph, Earl R.
N.Y. The Ronald Press , 1961
Buku Teks
Hansen, Bent, author
Harvard University Press , 1958
Buku Teks
Mikesell, John L., author
Cengage Learning, 2018
Buku Teks
Hey, L., author
Sie Isaac Pitman, 1972
Buku Teks