Symposium on Horticultural Economics Davis, Calif, International Society for Horticultural Science. Commission for Horticultural Economics and Management, International Horticultural Congress, & Goodrich, D. C. (1987). Ninth Symposium on Horticultural Economics: 22nd International Horticultural Congress, Davis, California, USA, August 11-20th, 1986. International Society for Horticultural Science.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Symposium on Horticultural Economics Davis, Calif, International Society for Horticultural Science. Commission for Horticultural Economics and Management, International Horticultural Congress, و Dana C. Goodrich. Ninth Symposium on Horticultural Economics: 22nd International Horticultural Congress, Davis, California, USA, August 11-20th, 1986. Wageningen, Netherlands: International Society for Horticultural Science, 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Symposium on Horticultural Economics Davis, Calif, et al. Ninth Symposium on Horticultural Economics: 22nd International Horticultural Congress, Davis, California, USA, August 11-20th, 1986. International Society for Horticultural Science, 1987.