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 Jackson, K. Student killed, buildings torched in savage Unitech attack. Keith Jackson & Friends: PNG Attitude (Blog). 26 June, 2016. Retrieved: https://asopa.typepad.com/asopa_people/2016/06/student-killed-buildings-torched-in-savage-unitech-attack.html (30/03/2019); Betasolo, M
Rena Lovo, Eric Gilder, Ora Renagi and Dapsy Olatona
-grid lighting market analysis 2014 . Retrieved: https://www.lightingglobal.org/wp-content/uploads/2014/07/PNG-Off-Grid-Lighting-Market-Analysis_May-2014_1.pdf .
 Gupta, S., et al. Micro renewable energies: Energy too little to harness, too large to lose (in print).
 Kondan, J. Final year project, PNGUoT, Lae, 2017 (unpublished).
 Mika, N. Private communication, 2018.
 University of Science and Technology of China. Smart China by discovery will report USTC intelligent lighting for crop growth project. Retrieved: https