Shiva Purana
अष्टांगो वा षडंगो वा सर्वयोगः समासतः ॥ यमश्च नियमश्चैव स्वस्तिकाद्यं तथासनम् ॥ १४ ॥
The eightfold or sixfold yoga is the sum total of all yogas. Yama and Niyama are the seats beginning with the swastika.
english translation
aSTAMgo vA SaDaMgo vA sarvayogaH samAsataH ॥ yamazca niyamazcaiva svastikAdyaM tathAsanam ॥ 14 ॥
hk transliteration by Sanscript