R. Hakkert
发表
D. Schensul,
R. Hakkert,
Guzmán Jm,
2012
.
R. Hakkert,
R. Wieringa,
Kapiri Mposhi,
1986,
International demographics.
R. Hakkert,
Guzmán Jm,
2001
.
Ana Luiza Machado,
Daniel Martínez,
C. Norton,
2005
.
R. Hakkert,
J. Franke,
R. Zeeuw,
1978
.
R. Hakkert,
2001
.
R. Hakkert,
1987,
Demography.
R. Hakkert,
2006
.
R. Hakkert,
2019,
Estudios demograficos y urbanos.
R. Hakkert,
2011
.
R. Hakkert,
2001,
Statistics in medicine.
R. Hakkert,
C. Gondo,
1984,
International demographics.
R. Kemp,
R. Hakkert,
2006
.
A. Zeeuw,
R. Hakkert,
2002,
Environment and Development Economics.
R. Hakkert,
Roger C. Avery,
1981,
Population studies.