APA

Schumacher E. F., . (1977). A guide for the perplexed. New York: Harper and Row.

Chicago

Schumacher E F, . 1977. A guide for the perplexed. New York: Harper and Row.

Harvard

Schumacher E. F., . (1977). A guide for the perplexed. New York: Harper and Row.

MLA

Schumacher E F, . A guide for the perplexed. New York: Harper and Row. 1977.