Rikken, G. (1993). The greening of Libertad: Case study of self-help approach to natural resource management featuring the Libertad Planters Association. Asian Social Institute in cooperation with Deutsche Gesellschaft fur Technische Zusammenarbeit (GTZ) GmbH.
Cita Chicago (17th ed.)Rikken, Gerard. The Greening of Libertad: Case Study of Self-help Approach to Natural Resource Management Featuring the Libertad Planters Association. Manila: Asian Social Institute in cooperation with Deutsche Gesellschaft fur Technische Zusammenarbeit (GTZ) GmbH, 1993.
Cita MLA (9th ed.)Rikken, Gerard. The Greening of Libertad: Case Study of Self-help Approach to Natural Resource Management Featuring the Libertad Planters Association. Asian Social Institute in cooperation with Deutsche Gesellschaft fur Technische Zusammenarbeit (GTZ) GmbH, 1993.