APA
Cheek D., .Sudoku Helper Mastermind Puzzles. Andrews McMeel Pub, 2006: .
Chicago
Cheek David, .Sudoku Helper Mastermind Puzzles. Andrews McMeel Pub, 2006: .
Harvard
Cheek D., .Sudoku Helper Mastermind Puzzles. Andrews McMeel Pub, 2006: .
MLA
Cheek David, .Andrews McMeel Pub, 2006: . .