Esser, R. (2008). Vitality: A psychiatrist's answer to life's problems. Algora Pub..
Lua i Stíl Chicago (17ú heag.)Esser, Richard. Vitality: A Psychiatrist's Answer to Life's Problems. New York: Algora Pub., 2008.
Lua MLA (9ú heag.)Esser, Richard. Vitality: A Psychiatrist's Answer to Life's Problems. Algora Pub., 2008.
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