APA

Gupta (Sunit); Gupta (Mukta), . (1998). Natural Resource Management (Need For 21st Centruy). : .

Chicago

Gupta (Sunit); Gupta (Mukta), . 1998. Natural Resource Management (Need For 21st Centruy). : .

Harvard

Gupta (Sunit); Gupta (Mukta), . (1998). Natural Resource Management (Need For 21st Centruy). : .

MLA

Gupta (Sunit); Gupta (Mukta), . Natural Resource Management (Need For 21st Centruy). : . 1998.