Alkämper, J. (1979). Erosion Control and afforestation in Haraz, Yemen Arab Republic. Tropeninst.
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Chicago-čujuhus (17. p.)
Alkämper, Jochen. Erosion Control and Afforestation in Haraz, Yemen Arab Republic. Giessen, Sana'a: Tropeninst, 1979.
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MLA-čujuhus (9. p.)
Alkämper, Jochen. Erosion Control and Afforestation in Haraz, Yemen Arab Republic. Tropeninst, 1979.
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