Ag professional [elektronický zdroj]. St. Louis, MO : Doane Agricultural Services, Co., c2003-. v. Dostupné na internetu: <http://sfx.jib.cz/sfxlcl3?url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/sfxit.com:opac_856&url_ctx_fmt=info:ofi/fmt:kev:mtx:ctx&sfx.ignore_date_threshold=1&rft.object_id=111088196493872&svc_val_fmt=info:ofi/fmt:kev:mtx:sch_svc&>