Solomon Northup: The Complete Story of the Author of Twelve Years a Slave.CS1 maint: Uses authors parameter (link), a complete biography of Northup Lester, Julius (1968).
Solomon Northup: The Complete Story of the Author of Twelve Years a Slave. Pemeliharaan CS1: Menggunakan parameter penulis (link) , a complete biography of Northup Lester, Julius (1968).