1. Abdu-Raheem, K.A. and Worth, S.H., 2011. Household food security in South Africa: evaluating extension’s paradigms relative to the current food security and development goals. Landbouvoorl./S. Afr. J. Agric. Ext. 39, 91–103. Available at: http://www.scielo.org.za/pdf/sajae/v39n2/08.pdf.
2. Altman, M., Hart, T., and Jacobs, P. 2009. Food security in South Africa. Hum. Sci. Res. Counc. 1, 1–29. Available at: http://www.tandfonline.com/doi/abs/10.1080/03031853.1992.9524684.
3. Atkinson, R. and Flint, J. 2001 Accessing hard to reach populations for research. Soc. Res. Updat. https://doi.org/10.1016/j.jchromb.2016.02.033.
4. Beltrán-Alcrudo, D., Labroth, J., Depner, K. and De La Rocque, S. 2008. African swine fever in the Caucasus. FAO Empres Watch. Available at: ftp://ftp.fao.org/docrep../FAO/011/aj214e/aj214e00.pdf.
5. Chah, J. M., Dimelu, M.U. and Ukwuani, S.U. 2014. Institutional and production characteristics among smallholder pig producers in Enugu State, Nigeria. Trop. Anim. Health Prod. 46, 1173–1176. https://doi.org/10.1007/s11250-014-0623-4.