Tompkins, P., & Bird, C. (1991). Secrets of the soil. Viking Arkana.
Chicagoスタイル(17版)引用形式Tompkins, Peter, , Christopher Bird. Secrets of the Soil. London: Viking Arkana, 1991.
MLA(9版)引用形式Tompkins, Peter, , Christopher Bird. Secrets of the Soil. Viking Arkana, 1991.
警告: この引用は必ずしも正確ではありません.