ผู้เขียน: Jan Hendrik Roodt

Helen Jeffrey is Principal Lecturer at Otago Polytechnic, Te Pukenga, New Zealand. Linda Robertson is Emeritus Associate Professor at Otago Polytechnic, Te Pukenga, New Zealand. Jan Hendrik Roodt is Academic Facilitator, Te Pukenga, New Zealand, and Director of Polar Analytics, Finland. Susan Ryan is Professor Emerita at University College Cork, Ireland.