Pomeroy, L. R. Cycles of essential elements. Dowden, Hutchinson.
芝加哥风格引文Pomeroy, Lawrence R. Cycles of Essential Elements. Stroudsburg, Pennsylvania: Dowden, Hutchinson.
MLA引文Pomeroy, Lawrence R. Cycles of Essential Elements. Dowden, Hutchinson.
警告：这些引文格式不一定是100％准确.