Oluf Chr. Bockman. (1990). Agriculture and fertilizers: Fertilizers in perspective. Norway: Norsk Hydro a.s.
シカゴスタイル引用形Oluf Chr. Bockman. Agriculture and Fertilizers: Fertilizers in Perspective. Norway: Norsk Hydro a.s, 1990.
MLA引用形式Oluf Chr. Bockman. Agriculture and Fertilizers: Fertilizers in Perspective. Norway: Norsk Hydro a.s, 1990.
警告: この引用は必ずしも正確ではありません.