• Hillebrandt, A. 1923. Altindische Politik. Jena: Verlag von Gustav Fischer.
• Ghoshal, U. N. 1959. A History of Indian Political Ideas: The Ancient Period & the Period of Transition to the Middle Ages. OUP.
• Losch, H. 1959. Rājadharma: Einsetzung und Aufgabenkreis des Kønigs im Lichte des Purāṇas. Bonn: Selbstverlag des Orientalischen Seminars der Universität Bonn.
• Drekmeier, C. 1962. Kingship and Community in Early India. Stanford: Stanford UP.
• Spellman, J.W. 1964. Political Theory of Ancient India: A Study of Kingship from the Earliest Times to ca. A.D. 300. Oxford: Clarendon Press.
• Sharma, R.S. 1968. Aspects of Political Ideas and Institutions in Ancient India. 2nd ed. Delhi: Motilal Banarsidass.
• Scharfe, Hartmut. 1989. The State in Indian Tradition. Leiden: E.J. Brill.

Even though the work is now dated, Ghoshal, in particular, is a good resource for directing the reader to relevant primary sources throughout the ancient period.