APA (7th ed.) Citation

Haar, D. t. (1967). The old quantum theory / by D.ter Haar. Pergamon.

Chicago Style (17th ed.) Citation

Haar, D. ter. The Old Quantum Theory / by D.ter Haar. Pergamon, 1967.

MLA (9th ed.) Citation

Haar, D. ter. The Old Quantum Theory / by D.ter Haar. Pergamon, 1967.

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