Larsen, J.A.O., "Perioikoi," RE 19 (1938) 816-833.
Flower, M.A. 'Revolutionary Agitation and Social Change in Classical Sparta,' Greek Studies in Honour of George Cawkwell.
Hamilton, C.D. 'Social Tensions in Classical Sparta,' Ktema 12. pp. 31-41.
Hodkinson, S. 'Social Order and the Conflict of Values in Classical Sparta,' Chiron 13, pp. 239-81.
Pipers, R.J. 'Spartan Helots in the Hellenistic Age,' AncSoc 15-17, pp. 75-88.
Talbert, R.J.A., 'The Role of the Helots in the Class Struggle at Sparta,' Historia 38 (1989) 22-40.