(2014) Early geographical exploration: Vasco da Gama in East Africa out of his Diary.  

This work Discuss the following: the Portuguese effect and impact on the East African region at an early stage when the first voyage of the Vasco da Gama, through his diary as a recorded of his whole journey and also discusses the goals and tasks of the Portuguese towards the Islamic world and their ambitions and their eagerness toll under the bounties of Muslims world and cut the old trade route of the Ottomans to find an alternative route lead to India. 

(2014) Portuguese in East Africa, the Arabian Peninsula and India: Vasco da Gama and his second voyage to Calcutta as told by a Dutch narrative with introduction and translation.