R.R. Bowker Company. Ulrich's International Peridiocals Directory. vol 1 a - m. R.R. Bower Company.
Cita Chicago Style (17a ed.)R.R. Bowker Company. Ulrich's International Peridiocals Directory. Vol 1 a - M. Nueva York: R.R. Bower Company.
Cita MLA (9a ed.)R.R. Bowker Company. Ulrich's International Peridiocals Directory. Vol 1 a - M. R.R. Bower Company.
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