Ching, G. (1973). 2000 word drills. National Book Store.
Chicago Style (17th ed.) CitationChing, Gregorio. 2000 Word Drills. Mandaluyong City: National Book Store, 1973.
MLA (9th ed.) CitationChing, Gregorio. 2000 Word Drills. National Book Store, 1973.
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