English discussion of *Upāyahṛdayaśāstra (*Prayogasāraśāstra)
Katsura, Shōryū. 2018. “The Mode of Argumentation in the Fangbian Xin Lun / *Upāyahṛdaya.” Wiener Zeitschrift Für Die Kunde Südasiens 56–57: 19–36.
- This relation of Katsura 2018 to the *Upāyahṛdayaśāstra (*Prayogasāraśāstra) was added from an external source.