Cook, G. E. (1987). Merrill spelling for word mastery: Level 5. Merrill.
芝加哥风格引文Cook, Gillian E. Merrill Spelling for Word Mastery: Level 5. Toronto: Merrill, 1987.
MLA引文Cook, Gillian E. Merrill Spelling for Word Mastery: Level 5. Merrill, 1987.
警告：这些引文格式不一定是100％准确.