Valderrama, J. H. (1982). An improvised electric device and suggested laboratory activities to teach the effects of electricity on certain physiological processes in selected seeds.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Valderrama, Josefina Husayan. An Improvised Electric Device and Suggested Laboratory Activities to Teach the Effects of Electricity on Certain Physiological Processes in Selected Seeds. 1982.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Valderrama, Josefina Husayan. An Improvised Electric Device and Suggested Laboratory Activities to Teach the Effects of Electricity on Certain Physiological Processes in Selected Seeds. 1982.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.