Leach, N., & Gattuso, J. (1999). Whale watching. Discovery Communications.
Chicagoスタイル(17版)引用形式Leach, Nicky, , John Gattuso. Whale Watching. Singapore: Discovery Communications, 1999.
MLA(9版)引用形式Leach, Nicky, , John Gattuso. Whale Watching. Discovery Communications, 1999.
警告: この引用は必ずしも正確ではありません.