Geulen, C. (2012). Reply: Christian Geulen. Contributions to the history of concepts.
Citazione stile Chigago Style (17a edizione)Geulen, Christian. "Reply: Christian Geulen." Contributions to the History of Concepts 2012.
Citatione MLA (8a ed.)Geulen, Christian. "Reply: Christian Geulen." Contributions to the History of Concepts, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.