TY  - BOOK
AU  - Duffett-Smith, Peter
AU  - Zwart, Jonathan
TI  - Practical astronomy with your calculator or spreadsheet
SN  - 978-0-521-14654-8
PY  - 2011///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Astronomy-Problems, exercises, etc
KW  - Calculators-Problems, exercises, etc
KW  - Electronic spreadsheets in education
ER  -