David, I. P. (1985). Keeping sample survey design and analysis simple. Asian Development Bank Economics Office.
Lua i Stíl Chicago (17ú heag.)David, I. P. Keeping Sample Survey Design and Analysis Simple. Manila: Asian Development Bank Economics Office, 1985.
Lua MLA (9ú heag.)David, I. P. Keeping Sample Survey Design and Analysis Simple. Asian Development Bank Economics Office, 1985.
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