Engelken, R., Engelken, R., & Slattery, P. (1981). The art of natural farming & gardening. Barrington Hall Press.
Chicagoスタイル(17版)引用形式Engelken, Ralph, Rita Engelken, , Pat Slattery. The Art of Natural Farming & Gardening. Greeley, Iowa: Barrington Hall Press, 1981.
MLA(8版)引用形式Engelken, Ralph, et al. The Art of Natural Farming & Gardening. Barrington Hall Press, 1981.
警告: この引用は必ずしも正確ではありません.