APA

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

Chicago

Welch Paul S, . 1948. Limological methods. New York: McGraw-Hill.

Harvard

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

MLA

Welch Paul S, . Limological methods. New York: McGraw-Hill. 1948.