Columbia subject headings:
Psychology, Comparative--History--20th century--Congresses.
Psychology, Comparative--History--Congresses.
Harvard subject headings:
Psychology, Comparative--History--20th century--Congresses.
Psychology, Comparative--History--Congresses.
Princeton subject headings:
Psychology, Comparative--History--20th century--Congresses.
Psychology, Comparative--History--Congresses.