Shiva Purana
प्रधानबुद्ध्यहंकारमनांसि च चतुष्टयम् ॥ समासादेवमव्यक्तं सविकारमुदाहृतम् ॥ ३८ ॥
The four elements are primary intelligence, ego and mind. In summary the unmanifest with its transformations is described.
english translation
pradhAnabuddhyahaMkAramanAMsi ca catuSTayam ॥ samAsAdevamavyaktaM savikAramudAhRtam ॥ 38 ॥
hk transliteration by Sanscript