المؤلفون: Agyepong, Gottfried Tenkorang, Gyasi, Edwin A., Nabila, John S., Kufogbe, Sosthenes K.

المصدر: People and their Planet ; page 251-271 ; ISBN 9781349271849 9781349271825

الاتاحة: http://dx.doi.org/10.1007/978-1-349-27182-5_16
http://link.springer.com/content/pdf/10.1007/978-1-349-27182-5_16