Maton, Anthea;Jean Hopkins, Charles William McLaughlin, Susan Johnson, Maryanna Quon Warner, David LaHart, Jill D. Wright. Human Biology and Health. Englewood Cliffs, New Jersey, USA:Prentice Hall,1993. ISBN 0-13-981176-1. OCLC32308337.
Maton, Anthea;Jean Hopkins, Charles William McLaughlin, Susan Johnson, Maryanna Quon Warner, David LaHart, Jill D. Wright. Human Biology and Health. Englewood Cliffs, New Jersey, USA:Prentice Hall,1993. ISBN 0-13-981176-1. OCLC32308337.