APA
Ritchie I., Hayes W., . (1998). A guide to the implementation of the ISO 14000 series on environmental management. Upper Saddle River, N.J: Prentice Hall.
Chicago
Ritchie Ingrid, Hayes William, . 1998. A guide to the implementation of the ISO 14000 series on environmental management. Upper Saddle River, N.J: Prentice Hall.
Harvard
Ritchie I., Hayes W., . (1998). A guide to the implementation of the ISO 14000 series on environmental management. Upper Saddle River, N.J: Prentice Hall.
MLA
Ritchie Ingrid, Hayes William, . A guide to the implementation of the ISO 14000 series on environmental management. Upper Saddle River, N.J: Prentice Hall. 1998.