Erickson, Mia L., author
Slack, 2012
Buku Teks
Gary A. Shankman, Robert C. Manske, editor
Elsevier Mosby, 2011
Buku Teks
Nesmith, Eleanor Lynn, foreword
Rockport Publishers, 1995
Buku Teks
Ainsworth, Elizabeth, author
Slack Incorporated, 2011
Buku Teks
edited by William Wels
Lippincott Williams & Wilkins, 2003
Buku Teks