Pius <Papa, I., Wolkan, R., & Heck, A. v. (2007). Enee Silvii Piccolominei Epistolarium seculare: Post Rudolf Wolkan iterum recogn. ed. Adrianus van Heck. Biblioteca Apostolica Vaticana.
Lua i Stíl Chicago (17ú heag.)Pius <Papa, II.>, Rudolf Wolkan, agus Adrianus van Heck. Enee Silvii Piccolominei Epistolarium Seculare: Post Rudolf Wolkan Iterum Recogn. Ed. Adrianus Van Heck. Città del Vaticano: Biblioteca Apostolica Vaticana, 2007.
Lua MLA (8ú heag.)Pius <Papa, II.>, et al. Enee Silvii Piccolominei Epistolarium Seculare: Post Rudolf Wolkan Iterum Recogn. Ed. Adrianus Van Heck. Biblioteca Apostolica Vaticana, 2007.
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