APA

Barth G., . (1964). Bitter strengh. Cambridge, Mass: Harvard University press.

Chicago

Barth Gunther, . 1964. Bitter strengh. Cambridge, Mass: Harvard University press.

Harvard

Barth G., . (1964). Bitter strengh. Cambridge, Mass: Harvard University press.

MLA

Barth Gunther, . Bitter strengh. Cambridge, Mass: Harvard University press. 1964.