Michelle A, Hopkins J, McLaughlin CW, Johnson S, Warner MQ, LaHart D, Wright JD. Human Biology and Health. Englewood Cliffs, New Jersey, USA: Prentice Hall, 1993. ISBN 0-13-981176-1.OCLC 32308337
Michelle A, Hopkins J, McLaughlin CW, Johnson S, Warner MQ, LaHart D, Wright JD. Human Biology and Health. Englewood Cliffs, New Jersey, USA: Prentice Hall, 1993. ISBN 0-13-981176-1.OCLC 32308337