44
by Comte, Auguste
Published 1850
L. Mathias

50
by Cochrane, Charles
Published 1849
W.S. Johnson

52
by Grunwald, Klaus
Published 2018
Nomos Verlagsgesellschaft mbH & Co. KG

54
Published 2018
OECD Publishing

55
Published 2019
OECD Publishing

56
Published 2001
OECD Publishing

57
Published 1999
OECD Publishing

58
Published 2006
OECD Publishing

60
Published 2001
OECD Publishing