Não informado. (1978). Rural Extension, Education and Training Abstracts. Commonwealth Agricultural Bureau.
Style de citation Chicago (17e éd.)Não informado. Rural Extension, Education and Training Abstracts. Farnham Royal, Inglaterra: Commonwealth Agricultural Bureau, 1978.
Style de citation MLA (8e éd.)Não informado. Rural Extension, Education and Training Abstracts. Commonwealth Agricultural Bureau, 1978.
Attention : ces citations peuvent ne pas être correctes à 100%.