APA

Grahn Y., . (1978). Chitinozoan stratigraphy and palaeoecology at the Ordovician-Silurian boundary in Skåne, southernmost Sweden. Stockholm: Sveriges Geologiska Undersökning. Serie C nr 744.

Chicago

Grahn Y, . 1978. Chitinozoan stratigraphy and palaeoecology at the Ordovician-Silurian boundary in Skåne, southernmost Sweden. Stockholm: Sveriges Geologiska Undersökning. Serie C nr 744.

Harvard

Grahn Y., . (1978). Chitinozoan stratigraphy and palaeoecology at the Ordovician-Silurian boundary in Skåne, southernmost Sweden. Stockholm: Sveriges Geologiska Undersökning. Serie C nr 744.

MLA

Grahn Y, . Chitinozoan stratigraphy and palaeoecology at the Ordovician-Silurian boundary in Skåne, southernmost Sweden. Stockholm: Sveriges Geologiska Undersökning. Serie C nr 744. 1978.