Akhtar, Vaḥīd. 1986. “ʿAnāṣir-e falsafa-ye wujūdī dar fikr-e Iqbāl [Elements of Existential Philosophy in Iqbāl's Thought].” In Dar shinākht-e Iqbāl [On Knowing Iqbāl], edited by Gh. Sotudah, 393-402. Tehran: Ministry of Culture and Islamic Guidance.
Durant, Will. 1926. The Story of Philosophy. New York: Garden City Publishing Co., Inc.
Haddad-Adel, Gholam Ali. 2013. Bā iḥtirām: Majmūʿa-ye maqālāt-e ihdāʾ shuda ba asātīd [With all Due Respect: A Collection of Articles Dediated to Various Scholars]. Tehran: Hermes.
Iqbāl, Mohammad. 1920. The Secrets of the Self. Translated by R. A. Nicholson. London: MacMillan and Co. Limited.
Magee, Bryan. 1992. The Great Philosophers: An Introduction to Western Philosophy. New York: Oxford University Press.
Mīnuvī, Mujtabā. 2009. Iqbāl-e Lāhūri: Shā’ir-e pārsīgū-yi Pākistān [Iqbāl of Lahore: The Persian Poet of Pakistan]. Tehran: Asātir Press.
Nietzsche, F. 1966. Beyond Good and Evil: Prelude to a Philosophy of the Future. Translated by W. Kaufman. New York: Vintage Books.
Schopenhauer, Arthur. 1966. The World as Will and Representation. Translated by E. F. Payne. New York: Dover Publications, Inc.