Παραπομπή APA

Singer, E. (1954). Personality in handwriting: The guiding image in graphology. Duckworth.

Παραπομπή Chicago Style

Singer, Eric. Personality in Handwriting: The Guiding Image in Graphology. London: Duckworth, 1954.

Παραπομπή MLA

Singer, Eric. Personality in Handwriting: The Guiding Image in Graphology. Duckworth, 1954.