APA (7th ed.) Citation

Lettinga, J. P. (1963). In memoriam Prof. Dr J. J. Koopmans (24.XI.1886 – 14.IV.1963).

Chicago Style (17th ed.) Citation

Lettinga, J. P. In Memoriam Prof. Dr J. J. Koopmans (24.XI.1886 – 14.IV.1963). Leiden, 1963.

MLA (8th ed.) Citation

Lettinga, J. P. In Memoriam Prof. Dr J. J. Koopmans (24.XI.1886 – 14.IV.1963). 1963.