Princeton, Psychological Review Company 1911 118pp., with 96 illustrations in text, in the series "Psychological Review Publications. The Psychological Monographs" Vol.XIII no.4 (whole no.56), 25cm., softcover (bit used), stamp at verso of t.p., good, P98640
Princeton, Psychological Review Company 1915 [5] + 162pp., illustrated with some figures in text, in the series "Psychological Review Publications. The Psychological Monographs" Vol.XIX no.1 (whole no.81), 25cm., softcover, stamp at verso of t.p., good, P98643