by Judy Hall
by Scott Cunningham
by Yulia Van Doren
by Barbara Crandall
by Sinisa Vukovic
by Daniel M. Davis
by A. Melody, R. R. Jackson, Julianne P. Guilbault
by Carson Dellosa Education
by Eliza Mabelle
by Robert C. Feenstra, Alan M. Taylor
by Gerd Folkers, Hugo Kubinyi, Raimund Mannhold, Hendrik Timmerman, Hendrik Timmerman