Goorbergh, E. v. d., Zweerman, T. H., Saggau, E., & Sansone, P. (2001). Respectfully yours, signed and sealed, Francis of Assisi: Aspects of his authorship and focuses of his spirituality. Franciscan Institute.

Goorbergh, Edith van den, Th. H. Zweerman, Elise Saggau, и Paul Sansone. Respectfully Yours, Signed and Sealed, Francis of Assisi: Aspects of His Authorship and Focuses of His Spirituality. St. Bonaventure, New York: Franciscan Institute, 2001.

Goorbergh, Edith van den, et al. Respectfully Yours, Signed and Sealed, Francis of Assisi: Aspects of His Authorship and Focuses of His Spirituality. Franciscan Institute, 2001.