Hollander, J. E. (2018). Signo de Wellens. McGraw-Hill Education LLC..
Chicago-čujuhus (17. p.)Hollander, Judd E. Signo De Wellens. New York, N.Y.: McGraw-Hill Education LLC., 2018.
MLA-čujuhus (9. p.)Hollander, Judd E. Signo De Wellens. McGraw-Hill Education LLC., 2018.
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