Howlett, D., & Nagu, J. T. (2001). Agricultural project planning in Tanzania: A handbook on cycles and sequences, participation, identification, planning and design, economic and financial analysis, and environmental assessment of agricultural projects. Development and Project Planning Centre, University of Bradford.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Howlett, David, و Joseph Tarmo Nagu. Agricultural Project Planning in Tanzania: A Handbook on Cycles and Sequences, Participation, Identification, Planning and Design, Economic and Financial Analysis, and Environmental Assessment of Agricultural Projects. Mzumbe, Tanzania : Institute of Development Management ; United Kingdom: Development and Project Planning Centre, University of Bradford, 2001.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Howlett, David, و Joseph Tarmo Nagu. Agricultural Project Planning in Tanzania: A Handbook on Cycles and Sequences, Participation, Identification, Planning and Design, Economic and Financial Analysis, and Environmental Assessment of Agricultural Projects. Development and Project Planning Centre, University of Bradford, 2001.