Παραπομπή APA

Katz, N. (2009). Zen and the art of crossword puzzles: A journey down and across. Adams media.

Παραπομπή Chicago Style

Katz, Nikki. Zen and the Art of Crossword Puzzles: A Journey Down and Across. Avon: Adams media, 2009.

Παραπομπή MLA

Katz, Nikki. Zen and the Art of Crossword Puzzles: A Journey Down and Across. Adams media, 2009.