Johns, S. W. (1986). "Southern Africa: Buffer States Without a Conventional Buffer System". In J. Chay & T. E. Ross (Eds.), Buffer States in World Politics. Boulder: Westview Press.

Johns, S. W. “"Southern Africa: Buffer States Without a Conventional Buffer System".” In Buffer States in World Politics, edited by John Chay and Thomas E. Ross. Boulder: Westview Press, 1986.

Johns SW. "Southern Africa: Buffer States Without a Conventional Buffer System". In: Chay J, Ross TE, editors. Buffer States in World Politics. Boulder: Westview Press; 1986.

Johns, S. W. “"Southern Africa: Buffer States Without a Conventional Buffer System".” Buffer States in World Politics, edited by John Chay and Thomas E. Ross, Boulder: Westview Press, 1986.

Johns SW. "Southern Africa: Buffer States Without a Conventional Buffer System". In: Chay J, Ross TE, editors. Buffer States in World Politics. Boulder: Westview Press; 1986.