Cita APA (7a ed.)

Plaskett, J. S. (1906). Observatory building and instrumental equipment. Dept. of the Interior.

Cita Chicago Style (17a ed.)

Plaskett, John Stanley. Observatory Building and Instrumental Equipment. Ottawa: Dept. of the Interior, 1906.

Cita MLA (9a ed.)

Plaskett, John Stanley. Observatory Building and Instrumental Equipment. Dept. of the Interior, 1906.