Sills, M. D. (2016). Hearts, heads, & hands: A manual for teaching others to teach others. B & H Publishing Group.
Chicago-viite (17. p.)Sills, M. David. Hearts, Heads, & Hands: A Manual for Teaching Others to Teach Others. Nashville, Tennessee: B & H Publishing Group, 2016.
MLA-viite (9. p.)Sills, M. David. Hearts, Heads, & Hands: A Manual for Teaching Others to Teach Others. B & H Publishing Group, 2016.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.