Heffernan 1989, pp. 342–352. Heffernan, Michael (November 1989). "The Limits of Utopia: Henri Duveyrier and the Exploration of the Sahara in the Nineteenth Century". The Geographical Journal. 155 (3): 342–352. doi:10.2307/635209. JSTOR635209.
Heffernan 1989, p. 343. Heffernan, Michael (November 1989). "The Limits of Utopia: Henri Duveyrier and the Exploration of the Sahara in the Nineteenth Century". The Geographical Journal. 155 (3): 342–352. doi:10.2307/635209. JSTOR635209.
Heffernan 1989, p. 344. Heffernan, Michael (November 1989). "The Limits of Utopia: Henri Duveyrier and the Exploration of the Sahara in the Nineteenth Century". The Geographical Journal. 155 (3): 342–352. doi:10.2307/635209. JSTOR635209.
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Heffernan 1989, pp. 342–352. Heffernan, Michael (November 1989). "The Limits of Utopia: Henri Duveyrier and the Exploration of the Sahara in the Nineteenth Century". The Geographical Journal. 155 (3): 342–352. doi:10.2307/635209. JSTOR635209.
Heffernan 1989, p. 343. Heffernan, Michael (November 1989). "The Limits of Utopia: Henri Duveyrier and the Exploration of the Sahara in the Nineteenth Century". The Geographical Journal. 155 (3): 342–352. doi:10.2307/635209. JSTOR635209.
Heffernan 1989, p. 344. Heffernan, Michael (November 1989). "The Limits of Utopia: Henri Duveyrier and the Exploration of the Sahara in the Nineteenth Century". The Geographical Journal. 155 (3): 342–352. doi:10.2307/635209. JSTOR635209.