Gaya APA

Len, , E., Hadikusumo, . (1997,1994). Useful Vocabs Expressions And Idiomatic Problems . Yogyakarta: Kanisius.

Gaya MLA

Len, , Evelyn., Hadikusumo, . "Useful Vocabs Expressions And Idiomatic Problems". Yogyakarta: Kanisius, 1997,1994. Text.