APA
Russel K., . (1999). Puzzles Challenge. Newyork: John Wiley & Sons, Inc.
Chicago
Russel Kenneth, . 1999. Puzzles Challenge. Newyork: John Wiley & Sons, Inc.
Harvard
Russel K., . (1999). Puzzles Challenge. Newyork: John Wiley & Sons, Inc.
MLA
Russel Kenneth, . Puzzles Challenge. Newyork: John Wiley & Sons, Inc. 1999.