Carson, Rachel L.
Oxford University Press , 1967
Buku Teks
Weidner, Edward W.
McGraw-Hill Book Co , 1962
Buku Teks
Yang, Richard
The Forum Press, 1978
Buku Teks
La Fargue, Thomas Edward
Stanford University Press, 1937
Buku Teks
Tracy, Edward B.
Dodd, Mead, , 1971
Buku Teks