Watson, J. M., & Parker, R. G. (1872). National elementary speller: A critical work on pronunciation embracing strictly graded classification of the primitive and the more important derivative words of the English language for oral spelling, exercises for writing from dictation, prefixes, affixes, etc., etc. A.S. Barnes & Company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Watson, J. Madison, و Richard Green Parker. National Elementary Speller: A Critical Work on Pronunciation Embracing Strictly Graded Classification of the Primitive and the More Important Derivative Words of the English Language for Oral Spelling, Exercises for Writing from Dictation, Prefixes, Affixes, Etc., Etc. New York: A.S. Barnes & Company, 1872.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Watson, J. Madison, و Richard Green Parker. National Elementary Speller: A Critical Work on Pronunciation Embracing Strictly Graded Classification of the Primitive and the More Important Derivative Words of the English Language for Oral Spelling, Exercises for Writing from Dictation, Prefixes, Affixes, Etc., Etc. A.S. Barnes & Company, 1872.