"National Liberation Wars in the portuguese colonies". Cairo: Afro-Asian Publications, 1970
BOSGRA, Sietse J. & DIJK, Arnold van, "De strijd tegen het portugese kolonialisme. Angola, Mozambique, Guinee". Amsterdão: H.J. Paris, 1969.
«Press release and communique issued by Mr. Paulo J. Gumane after his return from Mozambique and after the emergency meeting of the Party Central Commitee which was held at the African Liberation Center, Lusaka, from 27th to 29th February, 1968»