1
by Ereira, Alan
Published 1990
British Broadcasting Corporation (BBC)

2
by Gerlach, Jonas
Published 2017
Modern Academic Publishing

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

4
by Dinzelbacher, Peter
Published 1996
Schöningh

5
by Rózsa, Erzsébet
Published 2005
Fink

6
by Justin Sands
Published 2018
MDPI - Multidisciplinary Digital Publishing Institute

7
by Bucher, Eva
Published 2017
Nomos Verlagsgesellschaft mbH & Co. KG

8
by José Luís Brandão
Published 2018
Coimbra University Press

9
by Carmen Soares
Published 2018
Coimbra University Press

10
by John A. Jillions
Published 2018
MDPI AG - Multidisciplinary Digital Publishing Institute