Lost Crops of Africa : Volume II: Vegetables, National Academies Press, 2006. ProQuest Ebook Central, https://ebookcentral.proquest.com/lib/penncharter/detail.action?docID=3378152 Chapter about Okra
Neumann, Caryn. “Food and Diet in Medieval Africa.” Food and Diet in Medieval History, Facts On File, 2019. History Research Center, online.infobase.com/Auth/Index?aid=171442&itemid=WEHRC&articleId=225615
O’Neal, Michael. “Food and Diet in Ancient Africa.” Food and Diet in Ancient History, Facts On File, 2019. History Research Center, online.infobase.com/Auth/Index?aid=171442&itemid=WEHRC&articleId=226170
The Cambridge World History of Food by 
The Oxford Encyclopedia of Food and Drink in America by 
Lost Crops of Africa by 
A Movable Feast by 
The Story of Food in the Human Past by 
The Visual Food encyclopedia by 
Ways of Eating by 
The Columbian Exchange: Biological and Cultural Consquences of 1492 by