APA-viite (7. p.)
ebrary, Inc, Sileri, P., & Gaspari, A. (2012). Anal fissure: Symptoms, diagnosis and treatment. Nova Science Publishers.
Chicago-viite (17. p.)
ebrary, Inc, Pierpaolo Sileri, ja Achille Gaspari. Anal Fissure: Symptoms, Diagnosis and Treatment. Hauppauge, N.Y.: Nova Science Publishers, 2012.
MLA-viite (9. p.)
ebrary, Inc, et al. Anal Fissure: Symptoms, Diagnosis and Treatment. Nova Science Publishers, 2012.
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