Callahan, Daniel
Abortion : law, choice & morality / Daniel Callahan
Collier-Macmillan Ltd., 1970
 Buku Teks
Boissohneau, Alice
Eileen McCullough
Toronto Simon and Pierre 1983
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H-Net book reviews enhancing scholarly communication with technology Eileen L. McGrath, Winifred Fordham Metz dan John B. Rutledge
 Artikel Jurnal
Gwartney, James D.
Economics Private and public choice / James D. Gwartney, Richard L. Stroup
FL. The Dryden Press, 1995
 Buku Teks
Gwartney, James D.
Economics private and public choice/ James D. gwartney, Richard L. Stroup
Harcourt Brace Jovanovich, Publisher, 1987
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