News website of Guardian 6 ship building contract
https://www.maritimefirstnewspaper.com/2018/05/28/soan-again-makes-nigeria-proud-homeland-integrated-offshore-services-goes-for-damens-new-built
http://www.clipperoil.com/news/homeland-signs-for-sixth-damen-3307-patrol/https://oceanhub.com/@damen-shipyards-gorinchem/homeland-signs-for-sixth-damen-3307-patrol
https://maritimequote.nl/homeland-signs-for-sixth-damen-3307-patrol