Lua APA (7ú heag.)

Pomeroy, L. R. Cycles of essential elements. Dowden, Hutchinson.

Lua i Stíl Chicago (17ú heag.)

Pomeroy, Lawrence R. Cycles of Essential Elements. Stroudsburg, Pennsylvania: Dowden, Hutchinson.

Lua MLA (9ú heag.)

Pomeroy, Lawrence R. Cycles of Essential Elements. Dowden, Hutchinson.

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