13. In addition to Alhaji Garba Sa'idu, John Laver and Eldridge Mohammadou, the colleagues who gave us the benefit of their expertise include: J.A. Adeniran, Jean Boyd, Louis Brenner, Gisela Brikay-Seidensticker, Khalifa Chater, Allan Christelow, Norbert Cyffer, Toyin Falola, Jan Hogendorn, John Hunwick, Mukhtar Muhammad Kwaru, Murray Last, Robin Law, Louise Lennihan, Abdullahi Mahadi, Suleiman Abdullahi Mohammed, Mansur Ibrahim Mukhtar, Yakubu Mukhtar, Ann O'Hear, John Philips, David Robinson, Musa Muhammad Salih, the late Wilhelm Seidensticker, Jay Spaulding, Priscilla Starratt, and Jean-Louis Triaud. An equally impressive number of research assistants also helped us to prepare the annotations: Cécile Frébourg, Muriel Gomez-Perez, Issiaka Mandé and Yacouba Manli in Paris, Jean-Paul Bado and François Ngate in Aix-en-Provence, Ibrahim Aliyu Kwaru and Abdulkarim Umar Dan Asabe in Kano, Abdulkadir Adamu in Zaria, Ismael Musa Montana in Tunis, as well as our own graduate students, Edmund Abaka, Philip Afeadie, Iheanyi Enwerem, Ibrahim Jumare, Femi Kolapo, Kwabena Opare-Akurang and Sean Stilwell at York University.