Spencer, Herbert, 1820-1903 ; Panīpatī, Ḵẖvājah G̱ẖulāmulḥasnain (1932) Falsafah-yi taʻlīm : yaʻnī Ḥakīm Harbat Spinsar kī kitāb "Ejūkeshan" kā tarjumah. Anjuman Taraqqī-yi Urdū. ISBN: .