APA

Ottenjann R., Elster K., . (1980). Atlas of diseases of the upper gastrointestinal tract : atlas de enfermedades del tracto gastrointestinal superior / Rudolf Ottenjann, Kurt Elster. Philadelphia: Smithkline Corporation.

Chicago

Ottenjann Rudolf, Elster Kurt, . 1980. Atlas of diseases of the upper gastrointestinal tract : atlas de enfermedades del tracto gastrointestinal superior / Rudolf Ottenjann, Kurt Elster. Philadelphia: Smithkline Corporation.

Harvard

Ottenjann R., Elster K., . (1980). Atlas of diseases of the upper gastrointestinal tract : atlas de enfermedades del tracto gastrointestinal superior / Rudolf Ottenjann, Kurt Elster. Philadelphia: Smithkline Corporation.

MLA

Ottenjann Rudolf, Elster Kurt, . Atlas of diseases of the upper gastrointestinal tract : atlas de enfermedades del tracto gastrointestinal superior / Rudolf Ottenjann, Kurt Elster. Philadelphia: Smithkline Corporation. 1980.