(2017). IELTS advantage writing skills. Delta Publishing.
Chicagoスタイル(17版)引用形式IELTS Advantage Writing Skills. Peaslake, England: Delta Publishing, 2017.
MLA(9版)引用形式IELTS Advantage Writing Skills. Delta Publishing, 2017.
警告: この引用は必ずしも正確ではありません.
APA(7版)引用形式