Shiva Purana
इति रुद्रा क्षभेदा हि प्रोक्ता वै मुखभेदतः । तत्तन्मंत्राञ्छृणु प्रीत्या क्रमाच्छैल्लेश्वरात्मजे ८१ ।
O daughter of the king of mountains, thus I have explained to you the different types of Rudrākṣas based on the number offaces. Please listen to the mantras with devotion.
english translation
iti rudrA kSabhedA hi proktA vai mukhabhedataH । tattanmaMtrAJchRNu prItyA kramAcchaillezvarAtmaje 81 ।
hk transliteration by Sanscript