1. The role of Chromolaena odorata in the dynamics of forests into savannah in Northern Cameroon;Achoundong,1993
2. Veld Types of South Africa;Acocks,1988
3. Triffids invade Natal;Byford-Jones;Farmer's Weekly,1979
4. Watch out for this alien;Byford-Jones;Farmers Weekly,1989
5. Asterales;Cheesman,1940