Duggan, Francis X
Paul Elmer More /Francis X. Duggan
Twayne, 1966
 Buku Teks
Hankes, Elmer Joseph
A universal second language / Elmer Joseph Hankes
The Hankes Foundation, 1992
 Buku Teks
Laski, Harold J., author
A Grammar of Politics
George Allen and Unwin, 1948
 Buku Teks
Laski, Harold J., author
A Grammar of Politics
George Allen and Unwin, 1950
 Buku Teks
Laski, Harold J., author
A grammar of politics
George Allen and Unwin, 1955
 Buku Teks
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