APA استشهاد

Halbertsma H. (2016). Colon classification (6.). ESS ESS publication.

استشهاد بنمط شيكاغو

Halbertsma H. Colon Classification. 6. New Delhi: ESS ESS publication, 2016.

MLA استشهاد

Halbertsma H. Colon Classification. 6. ESS ESS publication, 2016.