REFERENCE TO

\ɹˈɛfɹəns tuː], \ɹˈɛfɹəns tuː], \ɹ_ˈɛ_f_ɹ_ə_n_s t_uː]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd