Frankl, V. E. (2000). Man's search for ultimate meaning. Perseus Pub..
Cita Chicago Style (17a ed.)Frankl, Viktor E. Man's Search for Ultimate Meaning. Cambridge, Mass.: Perseus Pub., 2000.
Cita MLA (8a ed.)Frankl, Viktor E. Man's Search for Ultimate Meaning. Perseus Pub., 2000.
Precaución: Estas citas no son 100% exactas.