Gaya APA
Geyl, P, (.
(1974).
Debates with historians, 4 th imp Cet.pertama 1955
.
Collins:
Fontana.
Gaya MLA
Geyl, Pieter, (1887-1966).
"Debates with historians, 4 th imp Cet.pertama 1955 ".
Collins:
Fontana,
1974.
Buku.