APA

Welch P. S., . (1948). Limnological methods. New York: McGraw-Hill.

Chicago

Welch Paul Smith, . 1948. Limnological methods. New York: McGraw-Hill.

Harvard

Welch P. S., . (1948). Limnological methods. New York: McGraw-Hill.

MLA

Welch Paul Smith, . Limnological methods. New York: McGraw-Hill. 1948.