Kautilya's Arthashastra 2.31.2

2.31.2

hastyāyāmadviguṇotsedhaviṣkambhāyāmāṃ hastinīsthānādhikāṃ sapragrīvāṃ kumārīsaṃgrahāṃ prānmukhīm udanmukhīṃ vā śālāṃ niveśayet //

There shall be constructed an elephant stable twice as broad and twice as high as the length (áyáma) of an elephant, with separate apartments for female elephants, with projected entrance (sapragrívám), with posts called kumári, and with its door facing either the east or the north.