威廉 & 胡东霞. (2008). 最快速怀孕: Fastest way to get pregnant naturally. 北方文艺出版社.
Chicago Style (17th ed.) Citation威廉 and 胡东霞. 最快速怀孕: Fastest Way to Get Pregnant Naturally. 北方文艺出版社, 2008.
MLA citiranje威廉 and 胡东霞. 最快速怀孕: Fastest Way to Get Pregnant Naturally. 北方文艺出版社, 2008.
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