APA (7th ed.) Citation

Bell & Howell Co. Newspaper Indexing Center. National observer index. Newspaper Indexing Center, Micro Photo Division, Bell & Howell Company.

Chicago Style (17th ed.) Citation

Bell & Howell Co. Newspaper Indexing Center. National Observer Index. Wooster, Ohio: Newspaper Indexing Center, Micro Photo Division, Bell & Howell Company.

MLA (9th ed.) Citation

Bell & Howell Co. Newspaper Indexing Center. National Observer Index. Newspaper Indexing Center, Micro Photo Division, Bell & Howell Company.

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