Παραπομπή σε μορφή APA (7η εκδ.)

Niemelä, S. (1985). Duodenogastric reflux in patients with upper abdominal complaints or gastric ulcer: With particular reference to reflux-associated gastritis. Universitetsforlaget.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Niemelä, Seppo. Duodenogastric Reflux in Patients with Upper Abdominal Complaints or Gastric Ulcer: With Particular Reference to Reflux-associated Gastritis. Oslo: Universitetsforlaget, 1985.

Παραπομπή σε μορφή MLA (8th εκδ.)

Niemelä, Seppo. Duodenogastric Reflux in Patients with Upper Abdominal Complaints or Gastric Ulcer: With Particular Reference to Reflux-associated Gastritis. Universitetsforlaget, 1985.