APA
Gangstad E. O., . (1990). Natural resource management of water land. London: Chapman & Hall.
Chicago
Gangstad Edwars O, . 1990. Natural resource management of water land. London: Chapman & Hall.
Harvard
Gangstad E. O., . (1990). Natural resource management of water land. London: Chapman & Hall.
MLA
Gangstad Edwars O, . Natural resource management of water land. London: Chapman & Hall. 1990.