Republicanism is the school of thought which espouses appointment of the head of state using a method other than heredity, usually elections.
Regular Websites
Stanford Encyclopedia of Philosophy: Republicanism
Delves into the definition of the political school of thought, and breaks down into sections about political liberty, republican liberty, and the classical republican tradition. - Stanford Encyclopedia of Philosophy: Republicanism
http://plato.stanford.edu/entries/republicanism/
Follows the history of the birth and growth of the American Republican Party in words and pictures. - The Genesis of Republicanism
http://www.librarycompany.org/Republican/exhibition/ExhibitionIntro.htm
The Philosophy and Politics of Bruno Bauer
Provides information about Bauer and his republican philosophy. - The Philosophy and Politics of Bruno Bauer
http://www.cambridge.org/catalogue/catalogue.asp?isbn=9780521819770