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