APA (7th ed.) Citation

Lonergan, B. J. F. (1961). Insight: A study of human Understanding. Longmans, Green.

Chicago Style (17th ed.) Citation

Lonergan, Bernard J. F. Insight: A Study of Human Understanding. London: Longmans, Green, 1961.

MLA (9th ed.) Citation

Lonergan, Bernard J. F. Insight: A Study of Human Understanding. Longmans, Green, 1961.