Croft, K., & Cutchen, B. W. (1966). Science readings for students of English as a second language: With exercises for vocabulary development. Educational Services.
Παραπομπή σε μορφή Chicago (17η εκδ.)Croft, Kenneth, και Billye W. Cutchen. Science Readings for Students of English as a Second Language: With Exercises for Vocabulary Development. Washington: Educational Services, 1966.
Παραπομπή σε μορφή MLA (9th εκδ.)Croft, Kenneth, και Billye W. Cutchen. Science Readings for Students of English as a Second Language: With Exercises for Vocabulary Development. Educational Services, 1966.
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