@BOOK {ZACHMANN:1998, title = {Visual presentation of research results: IITA research guide, No. 45}, author = {Zachmann, R. and Siri, C. }, series = {IITA research guide, No. 45}, year = {1998}, month = {July}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, isbn = {978-131-131-2}, note = {28p.}, }