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• https://repository.nwu.ac.za:443/handle/10394/7285
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• https://repository.nwu.ac.za:443/handle/10394/9225
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• https://repository.nwu.ac.za:443/handle/10394/33108
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• https://repository.nwu.ac.za:443/handle/10394/33127
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• https://repository.nwu.ac.za:443/handle/10394/10711
• https://repository.nwu.ac.za:443/handle/10394/8779
• https://repository.nwu.ac.za:443/handle/10394/32092
• https://repository.nwu.ac.za:443/handle/10394/19196
• https://repository.nwu.ac.za:443/handle/10394/12206
• https://repository.nwu.ac.za:443/handle/10394/17815
• https://repository.nwu.ac.za:443/handle/10394/4927
• https://repository.nwu.ac.za:443/handle/10394/32820
• https://repository.nwu.ac.za:443/handle/10394/8558
• https://repository.nwu.ac.za:443/handle/10394/11026