Armstrong, Hillary A. “Elements in the Thought of Plotinus at Variance with Classical Intellectualism.” Journal of Hellenic Studies 93 (1974): 13–22.
Explores Plotinus's ideas concerning consciousness and the Divine Intellect.
Bussanich, John. The One and Its Relation to Intellect in Plotinus. Leiden, The Netherlands: E. J. Brill, 1988, 258p.
Provides detailed exegetical commentary on many of Plotinus's texts.
Hadot, Pierre. Plotinus: or, The Simplicity of Vision. Translated by Michael Chase. Chicago: The University of Chicago Press, 1993, 138p.
Attempts to create a spiritual portrait of Plotinus. Originally published in French in 1963.
Martin, R. M. “On Logical Structure and the Plotinic Cosmos.” Studies in Neoplatonism 4 (1982): 11-23.
Attempts to explain Plotinus's ideas in terms of present-day science and logic.
Meijer, P. A. Plotinus on the Good or the One (“Enneads” VI, 9): An Analytical Commentary. Amsterdam: J. C. Gieben, 1992, 381p.
Offers non-mainstream analysis of Plotinus's writing on the One.
O'Meara, Dominic J. An Introduction to the “Enneads.” Oxford Oxford University Press, 1993, 142p.
Explains Plotinus's understanding of the human condition.
Wilde, Dana. “Plotinus among the Critics.” Antigonish Review 89 (Spring, 1992): 23–28.
Uses some Plotinian concepts in a philosophical discussion concerning the meaning and value of poetry.
Additional coverage of Plotinus's life and career is contained in the following source published by the Gale Group: Dictionary of Literary Biography, Vol. 176.