O Brien, D. (2001). Derek O`Brien`s book of 1500 questions. Rila O Brien.
Chicagoスタイル(17版)引用形式O Brien, Derek. Derek O`Brien`s Book of 1500 Questions. Kolkata: Rila O Brien, 2001.
MLA(9版)引用形式O Brien, Derek. Derek O`Brien`s Book of 1500 Questions. Rila O Brien, 2001.
警告: この引用は必ずしも正確ではありません.