Natyashastra
पश्चिमेन बलिः पीतो रक्तश्चैवोत्तरेण तु । यादृशं दिशि यस्यां तु दैवतं परिकल्पितम् ॥ ४०॥
The western direction should be associated with a yellow offering, and the northern direction should be connected with a red offering. The offerings should correspond to the deity assigned to each direction.
english translation
pazcimena baliH pIto raktazcaivottareNa tu । yAdRzaM dizi yasyAM tu daivataM parikalpitam ॥ 40॥
hk transliteration by Sanscript