Lua APA (7ú heag.)

Wavwick, D. (1975). The sample survey: Theory & practice. McGraw Hill.

Lua i Stíl Chicago (17ú heag.)

Wavwick, D. The Sample Survey: Theory & Practice. NewYork: McGraw Hill, 1975.

Lua MLA (9ú heag.)

Wavwick, D. The Sample Survey: Theory & Practice. McGraw Hill, 1975.

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