Cita APA

Hammer, W., & Hammer, W. (1981). Occupational safety management and engineering (2.edition.). Englewood Cliffs, N.J.: Prentice Hall.

Citación estilo Chicago

Hammer, Willie, y Willie Hammer. Occupational Safety Management and Engineering. 2.edition. Englewood Cliffs, N.J.: Prentice Hall, 1981.

Cita MLA

Hammer, Willie, y Willie Hammer. Occupational Safety Management and Engineering. 2.edition. Englewood Cliffs, N.J.: Prentice Hall, 1981.