^The Life of Lazarillo de Tormes and His Fortunes and Adversities. Spain: Weeble. 1554. {{cite book}}: |first= missing |last= (help)
^S. Booker (2016). "Use of the knowledge tree as a mind map in a gerontological course for undergraduate nursing students". Journal of Nursing Education. 55 (3): 182–184. {{cite journal}}: |access-date= requires |url= (help)
^Clauss, M. (1997). "Source references and the scientist's mind-map: Harvard vs. vancouver style". Vol. 5, no. 3. p. 320. doi:10.5167/agstm196553226.
