Beckwith, J., Bergquist, C., & Hildebrand, R. (1986). How to design & build children's play equipment. Ortho Books.
Citace podle Chicago (17th ed.)Beckwith, Jay, Craig Bergquist, a Ron Hildebrand. How to Design & Build Children's Play Equipment. San Francisco, Calif: Ortho Books, 1986.
Citace podle MLA (9th ed.)Beckwith, Jay, et al. How to Design & Build Children's Play Equipment. Ortho Books, 1986.
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