المؤلفون: Youngberg, Garth, DeMuth, Suzanne P.

المصدر: Renewable Agriculture and Food Systems, 2013 Dec 01. 28(4), 294-328.

URL الوصول: https://www.jstor.org/stable/26333193

المؤلفون: Youngberg, Garth

المصدر: American Journal of Alternative Agriculture, 2001 Jan 01. 16(4), 146-146.

URL الوصول: https://www.jstor.org/stable/44509987

المؤلفون: Youngberg, Garth, Schaller, Neill

المصدر: American Journal of Alternative Agriculture, 1993 Oct 01. 8(4), 146-147.

URL الوصول: https://www.jstor.org/stable/44503766

المؤلفون: Youngberg, Garth, Harwood, Richard

المصدر: American Journal of Alternative Agriculture, 1989 Jan 01. 4(3/4), 100-100.

URL الوصول: https://www.jstor.org/stable/44507049

المؤلفون: Youngberg, Garth, Ridgway, Richard

المصدر: American Journal of Alternative Agriculture, 1988 Apr 01. 3(2/3), 50-50.

URL الوصول: https://www.jstor.org/stable/44503450

المؤلفون: Youngberg, Garth

المصدر: American Journal of Alternative Agriculture, 1989 Jan 01. 4(2), 50-51.

URL الوصول: https://www.jstor.org/stable/44503507

المؤلفون: Youngberg, Garth

المصدر: American Journal of Alternative Agriculture, 1987 Jan 01. 2(1), 2-2.

URL الوصول: https://www.jstor.org/stable/44503347

المؤلفون: Youngberg, Garth

المصدر: American Journal of Alternative Agriculture, 1986 Jan 01. 1(1), 2-2.

URL الوصول: https://www.jstor.org/stable/44506899

المؤلفون: Youngberg, Garth

المصدر: American Journal of Alternative Agriculture, 1990 Jan 01. 5(2), 50-50.

URL الوصول: https://www.jstor.org/stable/44507076

المؤلفون: Youngberg, Garth, Sauer, Richard J.

المصدر: American Journal of Alternative Agriculture, 1990 Jan 01. 5(4), 146-169.

URL الوصول: https://www.jstor.org/stable/44507089