Zafra, N. (1955). Historical aspects of truth: Paper read at the panel discussion held Friday, Jan. 14, 1955 ... in connection with the participation of the University of the Philippines in the Bicentennial celebration of Columbia University. s.n.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Zafra, Nicolas. Historical Aspects of Truth: Paper Read at the Panel Discussion Held Friday, Jan. 14, 1955 ... in Connection with the Participation of the University of the Philippines in the Bicentennial Celebration of Columbia University. [S.l: s.n, 1955.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Zafra, Nicolas. Historical Aspects of Truth: Paper Read at the Panel Discussion Held Friday, Jan. 14, 1955 ... in Connection with the Participation of the University of the Philippines in the Bicentennial Celebration of Columbia University. s.n, 1955.