National Research Council (U.S.). Building Research Institute & ebrary, Inc. (1956). Modern masonry: Natural stone and clay products : the edited papers and discussions of a research correlation conference [...]. National Academy of Sciences.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Research Council (U.S.). Building Research Institute و Inc ebrary. Modern Masonry: Natural Stone and Clay Products : The Edited Papers and Discussions of a Research Correlation Conference [...]. Washington: National Academy of Sciences, 1956.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Research Council (U.S.). Building Research Institute و Inc ebrary. Modern Masonry: Natural Stone and Clay Products : The Edited Papers and Discussions of a Research Correlation Conference [...]. National Academy of Sciences, 1956.