Penggayaan APA
SEN, Ashish K., SMITH, Tony E.. (1995).
Gravity models of spatial interaction behavior .
Berlin:
Springer-Verlag.
Chicago Style
SEN, Ashish K., SMITH, Tony E..
Gravity models of spatial interaction behavior.
Berlin:
Springer-Verlag,
1995.
Buku.
MLA Style
SEN, Ashish K., SMITH, Tony E..
Gravity models of spatial interaction behavior.
Berlin:
Springer-Verlag,
1995.
Buku.
Turabian Style
SEN, Ashish K., SMITH, Tony E..
Gravity models of spatial interaction behavior.
Berlin:
Springer-Verlag,
1995.
Buku.