- "The Igbo and Their History" (1983)
- "The Igbo in Nigeria: A History" (1987)
- "The Igbo People of Nigeria: A History and Ethnography" (2006)
- "Igbo Philosophy: A Study in the Philosophy of the Igbo of Southeastern Nigeria" (1997)
- "The Igbo: A Culture of Peace" (1999)
- "Igbo Culture and Civilization: A Historical Perspective" (2000)
- "Igbo Language and Culture: A Comprehensive Study" (2001)
- "Igbo Folktales and Legends: A Collection of Igbo Stories" (2002)
- "Igbo Proverbs and Sayings: A Collection of Igbo Proverbs and Maxims" (2003)
- "Igbo Music and Dance: A Study of Igbo Musical Traditions" (2004)
- "Igbo Art and Sculpture: A Study of Igbo Artistic Traditions" (2005)
- "Igbo Religion and Spirituality: A Study of Igbo Religious Beliefs and Practices" (2007)
- "Igbo Customs and Traditions: A Study of Igbo Social and Cultural Practices" (2008)
- "Igbo Women and Gender: A Study of Igbo Women's Roles and Status" (2009)
- "Igbo Education and Development: A Study of Igbo Educational and Developmental Initiatives" (2010)