The material covered in the course is dealt with in most standard environmental economics textbooks. You will need to have a textbook to refer to, since you will be expected to study some of the course material on your own.
(K) Kolstad, C.D. (2000) Environmental Economics, New York: Oxford University Press
(L) Lesser, J.A., Dodds, D.E. and R.O. Zerbe (Jnr) (1997) Environmental Economics and Policy, New York: Addison Wesley
(T) Tietenberg, T.H. (2001) Environmental Economics and Policy, 3rd Edition, New York: Addison Wesley Longman
(P) Perman R., Ma Y.,McGilvaray J. And Common M. (1999) Natural Resource And Environmental Economics, 2nd Edition, Great Britain: Henry Ling Ltd
(HSW ) Nick Hanley, Jason F Shogren and Ben White (2007), Environmental Economics in Theory and Practice. 2nd Edition. Palgrave Macmillan
All these books cover the course material adequately and the choice between them is largely a question of which style appeals to you most (and availability too). If you cannot get the latest edition, earlier editions are adequate. In addition to these textbooks, it is important that you read the relevant sections of local newspapers so that you keep up with the developments in the Zimbabwean environmental debate.