W. Awadzi, T., Y. Bredwa-Mensah, H. Breuning-Madsen, og E. Boateng. “A Scientific Evaluation of the Agricultural Experiments at Frederiksgave, the Royal Danish Plantation on the Gold Coast, Ghana”. Geografisk Tidsskrift, bd. 101, januar 2001, https://tidsskrift.dk/geografisktidsskrift/article/view/42410.