Gaya APA

ROBERT, O., ETTY, S. ([s.a.]). Focus on English Idioms . Tangerang Selatan: Karisma Publishing Group.

Gaya MLA

ROBERT, Oeban., ETTY, Soelistyowati. "Focus on English Idioms". Tangerang Selatan: Karisma Publishing Group, [s.a.]. Text.