Rasarnavasudhakara 3.547

3.547

atha sadṛśa-nirdeśaḥ-
sadṛśaḥ sadṛśo vācyo vayasyety āhvayena vā | 326
haleti sakhyā tu sakhī kathanīyā sakhīti vā ||

Now, the address to equals:
An equal should be addressed by an equal by name or by the appellation 'vayasya'. / But a female friend is to be addressed by a female friend as 'halā' or as 'sakhī'.