1
by Rózsa, Erzsébet
Published 2005
Fink

2
by Ereira, Alan
Published 1990
British Broadcasting Corporation (BBC)

3
by Ronald Witt
Published 2013
MDPI AG - Multidisciplinary Digital Publishing Institute

4
by Dinzelbacher, Peter
Published 1996
Schöningh

5
by Gerlach, Jonas
Published 2017
Modern Academic Publishing

6
by John A. Jillions
Published 2018
MDPI AG - Multidisciplinary Digital Publishing Institute

7
by José Luís Brandão
Published 2018
Coimbra University Press

8
by Carmen Soares
Published 2018
Coimbra University Press

9
by Justin Sands
Published 2018
MDPI - Multidisciplinary Digital Publishing Institute

10
by Klum, Edith
Published 1965
Peter Lang International Academic Publishers

11
by McDaniel, June
Published 2019
MDPI - Multidisciplinary Digital Publishing Institute

12
by Hernandez, Jill Graper
Published 2019
MDPI - Multidisciplinary Digital Publishing Institute

13
by Petts, Richard J.
Published 2019
MDPI - Multidisciplinary Digital Publishing Institute

14
by Bucher, Eva
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG