Gaya APA
Lewis, Arthur W.. (1969).
The principles of economic planning .
London:
Unwin University.
Gaya Chicago
Lewis, Arthur W..
The principles of economic planning.
London:
Unwin University,
1969.
.
Gaya MLA
Lewis, Arthur W..
The principles of economic planning.
London:
Unwin University,
1969.
.
Gaya Turabian
Lewis, Arthur W..
The principles of economic planning.
London:
Unwin University,
1969.
.