Regional Conference for Africa, Luanda. (1971). Soil mechanics and foundation engineering: Proceedings. Mecânica dos solos e engenharia de fundações; actas. Laboratório de Engenharia de Angola.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিRegional Conference for Africa, Luanda. Soil Mechanics and Foundation Engineering: Proceedings. Mecânica Dos Solos E Engenharia De Fundações; Actas. Luanda: Laboratório de Engenharia de Angola, 1971.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিRegional Conference for Africa, Luanda. Soil Mechanics and Foundation Engineering: Proceedings. Mecânica Dos Solos E Engenharia De Fundações; Actas. Laboratório de Engenharia de Angola, 1971.
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