Shiva Purana
सुधामा कश्यपश्चैव वसिष्ठो विरजास्तथा ॥ अत्रिरुग्रो गुरुश्रेष्ठः श्रवनोथ श्रविष्टकः ॥ १४ ॥
Sudhamā Kasyapa Vasishta and Viraja Atrirugra is the best of the teachers and Shravanotha is the Shravishtaka.
english translation
sudhAmA kazyapazcaiva vasiSTho virajAstathA ॥ atrirugro guruzreSThaH zravanotha zraviSTakaH ॥ 14 ॥
hk transliteration by Sanscript