Blake, R. P. . e. (1963). Industrial safet (3d ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Blake, Roland Patton ed. Industrial Safet. 3d ed. Englewood Cliffs, N. J: Prentice-Hall, 1963.
Lua MLA (9ú heag.)Blake, Roland Patton ed. Industrial Safet. 3d ed. Prentice-Hall, 1963.
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