Authors: Arthur E. Brawer.
Authors: Magatte FAYE, Mamadou DEMBELE, Samba Tiapato FAYE, Biram NDIAYE, Madawas MBOUP, Omar SOW, Eugène GPA DIEME.
Authors: NDUAGU Samuel Uchechukwu, ONYEAGWARA Ngozi Carol, OGISI, Festus Oritsemajemite, MBATA Godwin Chukwuemeka.
Authors: Simon Raymond.