Gaya APA
Estrade, Sebastian. (1977).
The challenge of space .
Singapore:
federal publications.
Gaya Chicago
Estrade, Sebastian.
The challenge of space.
Singapore:
federal publications,
1977.
Text.
Gaya MLA
Estrade, Sebastian.
The challenge of space.
Singapore:
federal publications,
1977.
Text.
Gaya Turabian
Estrade, Sebastian.
The challenge of space.
Singapore:
federal publications,
1977.
Print.