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Ibrahim K. Sundiata: From Slaving to Neoslavery. The Bight of Biafra and Fernando Po in the Era of Abolition, 1827–1930. University of Wisconsin Press, Madison, Wis. 1996, ISBN 0-299-14510-7, S. 152 (uwpress.wisc.edu).
Ibrahim K. Sundiata: From Slaving to Neoslavery. The Bight of Biafra and Fernando Po in the Era of Abolitionn, 1827–1930. University of Wisconsin Press, Madison, Wis. 1966, S. 114 (uwpress.wisc.edu).
