Croft, K. (1966). Science readings for students of students of english as a second language with exercises for vocabulary development. McGraw-Hill.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Croft, Kenneth. Science Readings for Students of Students of English as a Second Language with Exercises for Vocabulary Development. McGraw-Hill, 1966.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Croft, Kenneth. Science Readings for Students of Students of English as a Second Language with Exercises for Vocabulary Development. McGraw-Hill, 1966.
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