Herbohn, John, Iean Russell, Stephen Harrison, Jerry Vanclay, Jack Baynes, Grant Wardell-Johnson, Ed Mangaoang, and Nestor Gregorio. 2007. “Improving the Triple Bottom Line Returns from Smallholder Tree Farms in the Philippines – A Systems Approach”. Proceedings of the 51st Annual Meeting of the ISSS - 2007, Tokyo, Japan 51 (2). https://journals.isss.org/index.php/proceedings51st/article/view/551.