Yule 1913 – Cathay and the Way Thither, Being a Collection of Medieval Notices of China / Transl. and ed. by H. Yule; new ed., revised throughout in the light of recent discoveries by H. Cordier. London, 1913. Vol. II: Odoric of Pordenone.
Zimmer 2001 – Zimmer D.E. A Guide to Nabokov’s Butterflies and Moths. Hamburg, 2001.
Zimmer 2006 – Zimmer D.E. Nabokov reist im Traum in das Innere Asiens. Hamburg, 2006.
Zimmer, Hartmann 2002–2003 – Zimmer D.E., Hartmann S. “The Amazing Music of Truth”: Nabokov’s Sources for Godunov’s Central Asian Travels in The Gift // Nabokov Studies. Vol. 7. 2002–2003. P. 33–74.
