APA

Ringwald F., United Nations. Economic Commission for Europe, . (1955). Use of electric light for the hot-house forcing of vegetables and early produce, and supplementary lighting of hen-houses to increase egg production. Geneva: United Nations Economic Commission for Europe.

Chicago

Ringwald F, United Nations. Economic Commission for Europe, . 1955. Use of electric light for the hot-house forcing of vegetables and early produce, and supplementary lighting of hen-houses to increase egg production. Geneva: United Nations Economic Commission for Europe.

Harvard

Ringwald F., United Nations. Economic Commission for Europe, . (1955). Use of electric light for the hot-house forcing of vegetables and early produce, and supplementary lighting of hen-houses to increase egg production. Geneva: United Nations Economic Commission for Europe.

MLA

Ringwald F, United Nations. Economic Commission for Europe, . Use of electric light for the hot-house forcing of vegetables and early produce, and supplementary lighting of hen-houses to increase egg production. Geneva: United Nations Economic Commission for Europe. 1955.