APA (7th ed.) Citation

Ivanov, M., & Stojkova, K. The Albian ammonites, nannofosils and sequence stratigraphy in Bulgaria.

Chicago Style (17th ed.) Citation

Ivanov, Marin, and Kristalina Stojkova. The Albian Ammonites, Nannofosils and Sequence Stratigraphy in Bulgaria.

MLA (9th ed.) Citation

Ivanov, Marin, and Kristalina Stojkova. The Albian Ammonites, Nannofosils and Sequence Stratigraphy in Bulgaria.

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