Citazione APA

University of the Philippines. Open University, Alfonso, G. J., & Reyes, J. C. (2005). Building the problem tree. U.P. Open University.

Stile di citazione Chicago

University of the Philippines. Open University, Grace Javier Alfonso, e Jaine C. Reyes. Building the Problem Tree. [Quezon City]: U.P. Open University, 2005.

Citazione MLA

University of the Philippines. Open University, et al. Building the Problem Tree. U.P. Open University, 2005.