Walawala, J. J. (1977). Survey and pathogenecity of plant parasitic nematodes associated with corn [microform]. Photoduplication Service. University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Walawala, Justino Jumamoy. Survey and Pathogenecity of Plant Parasitic Nematodes Associated with Corn [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Walawala, Justino Jumamoy. Survey and Pathogenecity of Plant Parasitic Nematodes Associated with Corn [microform]. Photoduplication Service. University of the Philippines Library, 1977.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.