Valleriani, Matteo; Citron, Nana (2020), Valleriani, Matteo (ed.), "Conrad Tockler's Research Agenda", De sphaera of Johannes de Sacrobosco in the Early Modern Period: The Authors of the Commentaries, Cham: Springer International Publishing, pp. 111–136, doi:10.1007/978-3-030-30833-9_5, hdl:21.11116/0000-0005-8AF9-7, ISBN978-3-030-30833-9
Valleriani, Matteo; Citron, Nana (2020), Valleriani, Matteo (ed.), "Conrad Tockler's Research Agenda", De sphaera of Johannes de Sacrobosco in the Early Modern Period: The Authors of the Commentaries, Cham: Springer International Publishing, pp. 111–136, doi:10.1007/978-3-030-30833-9_5, hdl:21.11116/0000-0005-8AF9-7, ISBN978-3-030-30833-9