Sibley, Charles Gald, author
Phylogeny and classification of birds: a study in molecular evolution
Yale University Press, 1991
 Buku Teks
Macmillan, W.M., author
The Road to self-rule a study in colonial evolution
Faber and Faber, 1959
 Buku Teks
Aumann, Francis R.
The Government and administration of Ohio / Francis R. Aumann
Thomas Y. Crowell Company, 1956
 Buku Teks
Simon, Yves R.
Philosophy of democratic government / Yves R. Simon
The University of Chicago Press, 1951
 Buku Teks
Simon, Yves R.
Philosophy of democratic government /​ Yves R. Simon.
University of Chicago Press, 1961
 Buku Teks
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