Meldrum, M. (1998). “A calculated risk”: The Salk polio vaccine field trials of 1954. British Medical Journal.
استشهاد بنمط شيكاغوMeldrum, Marcia. “A Calculated Risk”: The Salk Polio Vaccine Field Trials of 1954. British Medical Journal, 1998.
MLA استشهادMeldrum, Marcia. “A Calculated Risk”: The Salk Polio Vaccine Field Trials of 1954. British Medical Journal, 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.