Fine, Nathan J., author
Rand McNally, 1965
Buku Teks
Fine, Nathan J., author
Rand McNally, 1965
Buku Teks
Smyrl, J.L., author
Hodder and Stoughton, 1978
Buku Teks
Youse, Bevan K., author
Allyn and Bacon, 1974
Buku Teks
Podraza, Charles N.
Goodyear , 1969
Buku Teks