கேள்வி: முதலாம் வாசுதேவன் - உசாத்துணை பற்றி விளக்கவும்.
பதில்: * Falk, Harry (2001). "The yuga of Sphujiddhvaja and the era of the Kuṣâṇas." ''Silk Road Art and Archaeology VII'', pp.&nbsp;121–136. *Falk, Harry (2004). "The Kaniṣka era in Gupta records." Harry Falk. ''Silk Road Art and Archaeology X'', pp.&nbsp;167–176. *Sims-Williams, Nicholas (1998). "Further notes on the Bactrian inscription of Rabatak, with an Appendix on the names of Kujula Kadphises and Vima Taktu in Chinese." ''Proceedings of the Third European Conference of Iranian Studies Part 1: Old and Middle Iranian Studies''. Edited by Nicholas Sims-Williams. Wiesbaden. Pp, 79-93.