2007 Mode, A.W. AND Okonkwo, I.A. (2007), Stratigraphy and Paleoenvironmental Reconstruction of the Upper Cretaceous Strata in Agwu-Ugwueme-Lokpanta Area. Unpublished B.Sc. thesis, University of Nigeria, 103pp.

2012 Igwe, O., Nebedum, O, Okonkwo, I., Anibogu, E. (2012). The Characteristics of May, 2011 Rainfall-induced Debris Flow in Iva Valley, Enugu, South-eastern Nigeria. Proceedings of the International Consortium on Landslides (ICL), Kyoto. 103-110. 

2014 https://link.springer.com/article/10.1007/s12665-013-2647-x

2014 Okonkwo, I., Igwe, O., & Onuoha, K. M. (2014). Structural and Palaeostress Analysis of the Upper Cretaceous Afikpo Syncline, Southeastern Nigeria. Presented at the NMGS Annual Conference and Exhibition, Benin.

2014 Okonkwo, I. (2014, February 17). Sturctural and Paleostress Analysis of the Upper Cretaceous Afikpo Syncline, Southeastern Nigeria (MSc. Thesis). University of Nigeria, Nsukka, Nsukka.

2015 Igwe, O., Mode, A. W., Nnebedum, O., Okonkwo, I., & Oha, I. (2015). The mechanisms and characteristics of a complex rock-debris avalanche at the Nigeria–Cameroon border, West Africa. Geomorphology, 234, 1–10. http://doi.org/10.1016/j.geomorph.2014.12.040