Gaya APA
Elton, G.
(1978).
The practice of history (impr.ed). Cet. pertama 1969
.
Collins:
Fontana.
Gaya MLA
Elton, G.R..
"The practice of history (impr.ed). Cet. pertama 1969 ".
Collins:
Fontana,
1978.
Buku.