Gaya APA
Schafer, J. (1980).
Fundamentals of Helicopter Maintenance Rast-13 (Rast-13).
United States of America:
Aviation Maintenance Publishers.
Gaya MLA
Schafer, Joseph.
"Fundamentals of Helicopter Maintenance Rast-13".
Rast-13
United States of America:
Aviation Maintenance Publishers,
1980.
Text.