Lockowandte, Oskar (1976). "Lockowandte, Oskar Present status of the investigation of handwriting psychology as a diagnostic method". Catalog of Selected Documents in Psychology (6): 4–5. Urbani Paola, Processo alla grafologia: magia, arte o scienza?, Dedalo, 2004. Russel H. Driver, M. Ronald Buckley and Dwight D. Frink, Should We Write Off Graphology?, in International Journal of Selection and Assessment, vol. 4, n. 2, aprile 1996, pp. 78–86, DOI:10.1111/j.1468-2389.1996.tb00062.x. URL consultato il 28 agosto 2007.
Lockowandte, Oskar (1976). "Lockowandte, Oskar Present status of the investigation of handwriting psychology as a diagnostic method". Catalog of Selected Documents in Psychology (6): 4–5. Urbani Paola, Processo alla grafologia: magia, arte o scienza?, Dedalo, 2004. Russel H. Driver, M. Ronald Buckley and Dwight D. Frink, Should We Write Off Graphology?, in International Journal of Selection and Assessment, vol. 4, n. 2, aprile 1996, pp. 78–86, DOI:10.1111/j.1468-2389.1996.tb00062.x. URL consultato il 28 agosto 2007.
(EN) Barry Beyerstein Q&A, su Ask the Scientists, Scientific American Frontiers. URL consultato il 22 febbraio 2008 (archiviato dall'url originale il 5 aprile 2015). "they simply interpret the way we form these various features on the page in much the same way ancient oracles interpreted the entrails of oxen or smoke in the air. I.e., it's a kind of magical divination or fortune telling where 'like begets like.'"