(2021) Echo : Polish & Slavic Center 2021 [Nr 1] wiosna/spring.
(2021) Echo : Polish & Slavic Center 2021 [Nr 2] lato/summer.
(2021) Echo : Polish & Slavic Center 2021 [Nr 3] jesień/autumn.
(2021) Echo : Polish & Slavic Center 2021 [Nr 4] zima/winter.