APA

Petracek S., European information center for the further education of teachers, . (1985). Bulletin of the international bureau of education. Paris: Unesco.

Chicago

Petracek S, European information center for the further education of teachers, . 1985. Bulletin of the international bureau of education. Paris: Unesco.

Harvard

Petracek S., European information center for the further education of teachers, . (1985). Bulletin of the international bureau of education. Paris: Unesco.

MLA

Petracek S, European information center for the further education of teachers, . Bulletin of the international bureau of education. Paris: Unesco. 1985.