| Display: 41 to 43 |
| Olkowski, W.; Daar, S.; Olkowski, H. | 1995 | The gardener?s guide to common- sense pest control. | The Taunton Press. USA. |
| FADINAP. | 2000 | Integrated plant nutrition systems. | Training Manual. FADINAP/ PRUDD/RDS. http://www.fadinap.org/ipns/srilanka/ipnsmanual/toc.htm |
| Rehm, S.; Espig, G. | 2000 | The cultivated plants of the tropics and the subtropics. | Verlag Josef Margraf Scientific Books. Berlin. |
| Display: 41 to 43 |