Parkia biglobosa, the dawadawa tree (néré) and vitellaria paradoxa, the shea butter tree (karité) : a handbook for extension workers /
McAllan, Andy.
Aebischer, Dee.
Tomlinson, Helen.
Hill, Callum.
University of Wales.School of Agricultural and Forest Sciences.
Bangor : School of Agricultural and Forest Sciences, University of Wales,
1996.