Steinmetz, W., & Freeden, M. Introduction. Conceptual history: Challenges, conundrums, complexities / Willibald Steinmetz. Michael Freeden. Conceptual history in the European space.([2017]).
Lua i Stíl Chicago (17ú heag.)Steinmetz, Willibald, agus Michael Freeden. "Introduction. Conceptual History: Challenges, Conundrums, Complexities / Willibald Steinmetz. Michael Freeden." Conceptual History in the European Space.([2017]) .
Lua MLA (8ú heag.)Steinmetz, Willibald, agus Michael Freeden. "Introduction. Conceptual History: Challenges, Conundrums, Complexities / Willibald Steinmetz. Michael Freeden." Conceptual History in the European Space.([2017]), .
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