Dyfyniad APA
Frankl, V. E., Batthyany, A., & Tallon, A. (2010). The feeling of meaninglessness: A challenge to psychotherapy and philosophy. Marquette University Press.
Dyfyniad Arddull Chicago
Frankl, Viktor E., Alexander Batthyany, and Andrew Tallon. The Feeling of Meaninglessness: A Challenge to Psychotherapy and Philosophy. Milwaukee, Wis.: Marquette University Press, 2010.
Dyfyniad MLA
Frankl, Viktor E., et al. The Feeling of Meaninglessness: A Challenge to Psychotherapy and Philosophy. Marquette University Press, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.