Gaya APA
UMBGROVE, J. H. F.. (1947).
The Pulse of the Earth (2nd.ed).
Netherlands:
The Hague Martinus Nijhoff.
Gaya Chicago
UMBGROVE, J. H. F..
The Pulse of the Earth.
2nd.ed
Netherlands:
The Hague Martinus Nijhoff,
1947.
.
Gaya MLA
UMBGROVE, J. H. F..
The Pulse of the Earth.
2nd.ed
Netherlands:
The Hague Martinus Nijhoff,
1947.
.
Gaya Turabian
UMBGROVE, J. H. F..
The Pulse of the Earth.
2nd.ed
Netherlands:
The Hague Martinus Nijhoff,
1947.
.