Παραπομπή APA

Lehr, R. E. A., & Marchand , A. P. Orbital sysmmetry.

Παραπομπή Chicago Style

Lehr, Ronald E. And, και Alan P. Marchand. Orbital Sysmmetry.

Παραπομπή MLA

Lehr, Ronald E. And, και Alan P. Marchand. Orbital Sysmmetry.