Psychologie und Wirtschaftsleben pp. 192, Leipzig, 1912 Vocation and Learning pp. 289, St. Louis, 1912 Psychology and Industrial Efficiency pp. 321, Boston, 1913 American Patriotism pp. 262, New York, 1913 Grundzuege der Psychotechnik pp. 767, Leipzig, 1914 Psychology and Social Sanity pp. 320, New York, 1914 Psychology, General and Applied pp. 488, New York, 1914 The War and America pp. 210, New York, 1914 The Peace and America pp. 276, New York, 1915 The Photoplay New York, 1916