APA (7th ed.) Citation
Summa psychologica. (1969). Summa psychologica. Summa psychologica.
Chicago Style (17th ed.) Citation
Summa psychologica. Summa Psychologica. Stockholm: Summa psychologica, 1969.
MLA (9th ed.) Citation
Summa psychologica. Summa Psychologica. Summa psychologica, 1969.
Warning: These citations may not always be 100% accurate.