project, r., & photographs Paulo Cintra, L. C. C. (1990). Portugal in the opening of the world. Comissão Nacional para as Comemorações dos Descobrimentos Portugueses.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)project, research, و Laura Castro Caldas photographs Paulo Cintra. Portugal in the Opening of the World. Comissão Nacional para as Comemorações dos Descobrimentos Portugueses, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)project, research, و Laura Castro Caldas photographs Paulo Cintra. Portugal in the Opening of the World. Comissão Nacional para as Comemorações dos Descobrimentos Portugueses, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.