培生艺术史．11至15世纪艺术．Art from the 11th century to the 15th century 培生艺术史．16至17世纪艺术．Art from the 16th century to the 17th century 培生艺术史．18至19世纪艺术．Art from the 18th century to the 19th century Art from the 11th century to the 15th century Art from the 16th century to the 17th century Art from the 18th century to the 19th century 培生艺术史．20世纪至今的艺术．Art from the 20th century to the present research on socialism from the 19th century to the 21st century 公共关系史：17-20世纪：from the 17th to the 20th century 德国现代设计教育概述：从20世纪至21世纪初：from the 20th century to the early 21st century