APA引文

Santos, R. P., & Hopkins, G. M. (1965). The leaden echo and the golden echo: For baritone. s.n.].

芝加哥风格引文

Santos, Ramon Pagayon, 与 Gerald Manley Hopkins. The Leaden Echo and the Golden Echo: For Baritone. [S.l: s.n.], 1965.

MLA引文

Santos, Ramon Pagayon, 与 Gerald Manley Hopkins. The Leaden Echo and the Golden Echo: For Baritone. s.n.], 1965.

警告：这些引文格式不一定是100％准确.