Arthashastra
"मन्त्रि परिषदं द्वादश अमात्यान् कुर्वीत इति मानवाः षोडश इति बार्हस्पत्याः विंशतिम् इत्य् औशनसाः यथा सामर्थ्यम् इति कौटिल्यः" इति ॥
for example: "The school of Manu say that a king should make his assembly of ministers consist of twelve ministers; the school of Brihaspati say that it should consist of sixteen ministers; the school of Usans say it should contain twenty members; but Kautilya holds that it should contain as many ministers as the need of the kingdom requires.”
english translation
"mantri pariSadaM dvAdaza amAtyAn kurvIta iti mAnavAH SoDaza iti bArhaspatyAH viMzatim ity auzanasAH yathA sAmarthyam iti kauTilyaH" iti ॥
hk transliteration by Sanscript