Ganga, Z. N., Botigan, Y. B., Colting, R. D., Follosco, A. G., Tacloy, J. G., Bag-eo, R. G., & Cid, A. S. (2001). Improving sweet potato production and utilization in Sagada, Mt. Province. Cordillera Studies Center, University of the Philippines Baguio.

Ganga, Zenaida N., Yolanda B. Botigan, Rogelio D. Colting, Alicia G. Follosco, John G. Tacloy, Ramon G. Bag-eo, and Arlene S. Cid. Improving Sweet Potato Production and Utilization in Sagada, Mt. Province. Baguio City: Cordillera Studies Center, University of the Philippines Baguio, 2001.

Ganga, Zenaida N., et al. Improving Sweet Potato Production and Utilization in Sagada, Mt. Province. Cordillera Studies Center, University of the Philippines Baguio, 2001.