APA引用形式

Không rõ. (1979). Computer and Intractability. NOTNXB.

シカゴスタイル引用形

Không rõ. Computer and Intractability. NOTNXB, 1979.

MLA引用形式

Không rõ. Computer and Intractability. NOTNXB, 1979.

警告: この引用は必ずしも正確ではありません.