Otis, William Bradley
Barnes & Noble, 1939
Koleksi Publik
Needleman, Morris H.
Barnes & Noble, 1939
Koleksi Publik
Office of International Information Programs, 1991
Buku Teks SO
Sellman, Roger Raymond
Edward Arnold, 1954
Buku Referensi
translated by George H. Hanna
Foreign Languages Publishing House, 1960
Buku Teks SO