Sharma, Ram Sharan, author
Macmillan, 1980
Buku Teks
Fletcher, Sydney E., author
Grosset & Dunlap, 1954
Buku Teks
Palmer, Norman D.
Houghton Mifflin, 1961
Buku Teks
Palmer, Norman D.
Houghton Mifflin, 1971
Buku Teks
Palmer, Norman D.
Houghton Miffiln, 1971
Buku Teks