Watkin, D., & Cooper, R. (2020). Howard Flack and the Flack Parameter. MDPI.
Lua i Stíl Chicago (17ú heag.)Watkin, DJ, agus RI Cooper. Howard Flack and the Flack Parameter. MDPI, 2020.
Lua MLA (9ú heag.)Watkin, DJ, agus RI Cooper. Howard Flack and the Flack Parameter. MDPI, 2020.
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