Van Opstal, D. (1984). Technical excellence in America: Incentives for investment in human capital. Washington, DC : The Center for Strategic and International Studies.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিVan Opstal, Debra. Technical Excellence in America: Incentives for Investment in Human Capital. Washington, DC : The Center for Strategic and International Studies, 1984.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিVan Opstal, Debra. Technical Excellence in America: Incentives for Investment in Human Capital. Washington, DC : The Center for Strategic and International Studies, 1984.
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