APA (7th ed.) Citation

Es, L. V. (1931). The Age pithecanthropus. Martinus Nijhoff.

Chicago Style (17th ed.) Citation

Es, LJC Van. The Age Pithecanthropus. Martinus Nijhoff, 1931.

MLA (8th ed.) Citation

Es, LJC Van. The Age Pithecanthropus. Martinus Nijhoff, 1931.

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