2003 Getekend in Westerbork:Leven en werk van LeoKok 1923–1945 (Westerbork drawings: Life and work of LeoKok); ISBN 90-5018-107-4 Metzler Kabarett Lexikon
endangered lion Panthera leo population". Frontiers in Ecology and Evolution. 4 (4): 110. doi:10.3389/fevo.2016.00110. Tumenta, P. N.; Kok, J. S.; van Rijssel
competed for King of Kings and Dynamite Fighting Show. Kwasi is the former KOK welterweight champion. As of April 2023, he is ranked as the tenth best welterweight