http://www.ck12.org Chapter 1. Human Biology
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- Courtesy of the National Institutes of Health (NIH).. Public Domain
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- CK-12 Foundation - Zachary Wilson.. CC-BY-NC-SA 3.0
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- Bone: CK-12 Foundation - Christopher Auyeung; Tonsils: Klem (Wikimedia); Spleen: Henry Gray; Thymus:
LearnAnatomy (Wikipedia).. Bone: CC-BY-NC-SA 3.0; Tonsils and thymus: CC-BY 3.0; Spleen: Public
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- Courtesy of the Centers for Disease Control and Prevention.. Public Domain
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