Khakbazan, M. , Scott, S. , Block, H. , Robins, C. , McCaughey, W. (2009). 'Economic effects and Energy Use Efficiency of Incorporating Alfalfa and Fertilizer into Grass- Based Pasture Systems'. World Academy of Science, Engineering and Technology, Open Science Index 25, International Journal of Agricultural and Biosystems Engineering, 3(1), 39 - 44.