Bus, H. Trading slavery and liberation in the Americas: The Spanish-American connection in the works of Olaudah Equiano, Herman Melville, Martin R. Delany and Sutton E. Griggs / Heiner Bus. Black liberation in the Americas.(2001).

Bus, Heiner. "Trading Slavery and Liberation in the Americas: The Spanish-American Connection in the Works of Olaudah Equiano, Herman Melville, Martin R. Delany and Sutton E. Griggs / Heiner Bus." Black Liberation in the Americas.(2001) .

Bus, Heiner. "Trading Slavery and Liberation in the Americas: The Spanish-American Connection in the Works of Olaudah Equiano, Herman Melville, Martin R. Delany and Sutton E. Griggs / Heiner Bus." Black Liberation in the Americas.(2001), .