English discussion of *Upāyahṛdayaśāstra (*Prayogasāraśāstra)
Gillon, Brendan S. 2008. “An Early Buddhist Text on Logic: Fang Bian Xin Lun.” Argumentation 22 (1): 15–25.
- This relation of Gillon 2008 to the *Upāyahṛdayaśāstra (*Prayogasāraśāstra) was added from an external source.