Zweig, S. (1959). Sigmund Freud. Ediciones G. P.
Chicago Style (17th ed.) CitationZweig, Stefan. Sigmund Freud. Barcelona: Ediciones G. P, 1959.
MLA (9th ed.) CitationZweig, Stefan. Sigmund Freud. Ediciones G. P, 1959.
Warning: These citations may not always be 100% accurate.