APA (7th ed.) Citation

Held, A., & Knapp, G. F. (1881). Zwei Bücher zur socialen Geschichte Englands. Duncker and Humblot.

Chicago Style (17th ed.) Citation

Held, Adolf, and Georg Friedrich Knapp. Zwei Bücher Zur Socialen Geschichte Englands. Leipzig: Duncker and Humblot, 1881.

MLA (9th ed.) Citation

Held, Adolf, and Georg Friedrich Knapp. Zwei Bücher Zur Socialen Geschichte Englands. Duncker and Humblot, 1881.

Warning: These citations may not always be 100% accurate.