APA (7th ed.) Citation
(1989). XXVI Colloguium Spectroscopicum Internationale. Volume III.
Chicago Style (17th ed.) Citation
XXVI Colloguium Spectroscopicum Internationale. Volume III. Sofia, 1989.
MLA (9th ed.) Citation
XXVI Colloguium Spectroscopicum Internationale. Volume III. 1989.
Warning: These citations may not always be 100% accurate.