Caballo, V., Salazar, I., , Hofmann, S., & Curtiss, J. (1969). Psychometric properties of the Liebowitz Social Anxiety Scale in a large cross-cultural Spanish and Portuguese speaking sample. Revista Brasileira de Psiquiatria (Sao Paulo, Brazil : 1999), 41(2), 122-130. https://doi.org/10.1590/1516-4446-2018-0006 (Original work published 1969)