Biel, G. (1977). Collectorium in IV libros sentetiarum Guillelmi Occam. Georg Olms.
Cita Chicago (17th ed.)Biel, Gabriel. Collectorium in IV Libros Sentetiarum Guillelmi Occam. Hildesheim: Georg Olms, 1977.
Cita MLA (9th ed.)Biel, Gabriel. Collectorium in IV Libros Sentetiarum Guillelmi Occam. Georg Olms, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.