Geiger, W. E. (1978). Phytonymic derivational systems in the Romance languages: Studies in their origin and development. U.N.C. Dept. of Romance Languages.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Geiger, Walter E. Phytonymic Derivational Systems in the Romance Languages: Studies in Their Origin and Development. Chapel Hill: U.N.C. Dept. of Romance Languages, 1978.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Geiger, Walter E. Phytonymic Derivational Systems in the Romance Languages: Studies in Their Origin and Development. U.N.C. Dept. of Romance Languages, 1978.
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