Vishnupurana 3.6.28

3.6.28

āyurvedodhanurvedo gāndharvaścaiva te trayaḥ /
arthaśāstraṃ caturthaṃ tu vidya hyaṣṭādaśaiva tāḥ //

The four Vedas, the six Angas (or subsidiary portions of the Vedas, viz. Śikshá, rules of reciting the prayers, the accents and tones to be observed; Kalpa, ritual; Vyákarańa, grammar; Nirukta, glossarial comment; Chhandas, metre; and Jyotish, (astronomy), with Mímánsá (theology), Nyáya (logic), Dharma (the institutes of law), and the Puráńas, constitute the fourteen principal branches of knowledge: or they are considered as eighteen, with the addition of these four; the Áyur-veda, medical science (as taught by Dhanwantari); Dhanur-veda, the science of archery or arms, taught by Bhrigu; Gándharba-veda, or the drama, and the arts of music, dancing, &c., of which the Muni Bharata was the author; and the Artha śástram, or science of government, as laid down first by Vrihaspati.