Cita APA

Barden, C. D., Jeanrenaud, S., & Secker-Walker, J. (1993). Roles: The multi-purpose roles of tree planting: description, analysis and recommendations. [Lugar de publicación no identificado]: Shell International Petroleum Company Limited.

Citación estilo Chicago

Barden, C. D., Sally Jeanrenaud, y J. Secker-Walker. Roles: The Multi-purpose Roles of Tree Planting: Description, Analysis and Recommendations. [Lugar de publicación no identificado]: Shell International Petroleum Company Limited, 1993.

Cita MLA

Barden, C. D., Sally Jeanrenaud, y J. Secker-Walker. Roles: The Multi-purpose Roles of Tree Planting: Description, Analysis and Recommendations. [Lugar de publicación no identificado]: Shell International Petroleum Company Limited, 1993.