Speak up! : a short manual for students (and everyone else) in how to present stuff in front of an audience / Markus Öbrink ; with illustrations by Elizabeth Allyn Woock.    Olomouc : Palacký University Olomouc, 2018 . 90 stran ilustrace ; . ISBN 978-80-244-5299-9. ISBN 978-80-244-5300-2