APA-viite (7. p.)
Frankl, V. E., Batthyany, A., & Tallon, A. (2010). The feeling of meaninglessness: A challenge to psychotherapy and philosophy. Marquette University Press.
Chicago-viite (17. p.)
Frankl, Viktor E., Alexander Batthyany, ja Andrew Tallon. The Feeling of Meaninglessness: A Challenge to Psychotherapy and Philosophy. Milwaukee, Wis.: Marquette University Press, 2010.
MLA-viite (9. p.)
Frankl, Viktor E., et al. The Feeling of Meaninglessness: A Challenge to Psychotherapy and Philosophy. Marquette University Press, 2010.
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