Grijze haren professor die betrekking hebben op gezicht met boek - Stockfoto’s en -afbeeldingen

Grey hair professor looking out from book

Teacher in blue blouse obscuring face with book while standing near chalkboard

You should remember. Teacher formal wear and glasses looks smart, chalkboard background. Man unshaven holds book in front of face. Teacher insists on need to memorize information. Education concept.

Back view of senior lecturer writing something on blackboard with piece of chalk

Senior teacher in classroom at university or college. Male old tutor on board with notebook. Lesson seminar skills. Mature man study in high school

Panoramic shot of schoolchild holding chalk near chalkboard on green

Cropped view of businessman reading juridical book with intellectual property title isolated on grey

Cropped view of african american teacher writing on chalkboard

Selective focus of senior man reading book and holding glasses at home

Schoolboy pointing at copy space next to chalkboard

Portrait of focused businessman in eyeglasses reading notebook

Attentive businessman reading book with intellectual property title isolated on grey