APA

Iohannes Peckham, Etzkorn G. J., MacLaren B. R. & Iohannes Peckham. (2015). A critical edition and translation, with commentary, of John Pecham's Tractatus de sphaera. St. Bonaventure, NY: Franciscan Institute Publications.

Chicago

Iohannes Peckham, Etzkorn Girard J, MacLaren Bruce Robert and Iohannes Peckham. 2015. A critical edition and translation, with commentary, of John Pecham's Tractatus de sphaera. St. Bonaventure, NY: Franciscan Institute Publications.

Harvard

Iohannes Peckham, Etzkorn G. J., MacLaren B. R. and Iohannes Peckham. (2015). A critical edition and translation, with commentary, of John Pecham's Tractatus de sphaera. St. Bonaventure, NY: Franciscan Institute Publications.

MLA

Iohannes Peckham, Etzkorn Girard J, MacLaren Bruce Robert and Iohannes Peckham. A critical edition and translation, with commentary, of John Pecham's Tractatus de sphaera. St. Bonaventure, NY: Franciscan Institute Publications. 2015.