Lam, N. S. N., & De Cola, L. (1993). Fractals in geography. PTR Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Lam, Nina Siu Ngan, agus Lee De Cola. Fractals in Geography. Englewood Cliffs, N.J: PTR Prentice Hall, 1993.
Lua MLA (9ú heag.)Lam, Nina Siu Ngan, agus Lee De Cola. Fractals in Geography. PTR Prentice Hall, 1993.
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