Shiva Purana
शिखायां च त्रयं प्रोक्तं रुद्र क्षाणां महेश्वरि । कर्णयोः षट् च षट्चैव वामदक्षिणयोस्तथा २८ ।
O Maheśvarī, three Rudrākṣas must be worn on the tuft and six in each of the ears right and left.
english translation
zikhAyAM ca trayaM proktaM rudra kSANAM mahezvari । karNayoH SaT ca SaTcaiva vAmadakSiNayostathA 28 ।
hk transliteration by Sanscript