Siemens NX 8/8.5 surface design : a step by step guide
  MLA
  Koh, Jaecheol. Siemens Nx 8/8.5 Surface Design : a Step by Step Guide. Seoul: Onsia, 2014.
  APA
  Koh, J. (2014). Siemens NX 8/8.5 surface design : a step by step guide. Seoul: Onsia.
  Chicago
  Koh, Jaecheol, Siemens NX 8/8.5 Surface Design: A Step by Step Guide. Seoul: Onsia, 2014.