APA-viite (7. p.)

Raan, A. F. J. v. (1973). Excitation processes in helium: Electron-impact excitation and collisional transfer of excitation energy. s.n.].

Chicago-viite (17. p.)

Raan, Anthony Franciscus Joannes van. Excitation Processes in Helium: Electron-impact Excitation and Collisional Transfer of Excitation Energy. [S.l.: s.n.], 1973.

MLA-viite (8. p.)

Raan, Anthony Franciscus Joannes van. Excitation Processes in Helium: Electron-impact Excitation and Collisional Transfer of Excitation Energy. s.n.], 1973.