APA

Lewis R., . (1933). Elements of mining. New York: J.Wiley & Sons.

Chicago

Lewis Robert, . 1933. Elements of mining. New York: J.Wiley & Sons.

Harvard

Lewis R., . (1933). Elements of mining. New York: J.Wiley & Sons.

MLA

Lewis Robert, . Elements of mining. New York: J.Wiley & Sons. 1933.