Örstavik, I., Flugsrud, L. B., & Lahelle, O. (1971). Paralytic poliomyelitis in Norway since the introduction of trivalent oral vaccine: An epidemiological and virological study.
استشهاد بنمط شيكاغوÖrstavik, I., Liv B. Flugsrud, و O. Lahelle. Paralytic Poliomyelitis in Norway Since the Introduction of Trivalent Oral Vaccine: An Epidemiological and Virological Study. 1971.
MLA استشهادÖrstavik, I., Liv B. Flugsrud, و O. Lahelle. Paralytic Poliomyelitis in Norway Since the Introduction of Trivalent Oral Vaccine: An Epidemiological and Virological Study. 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.