https://robinsonheli.com/wp-content/uploads/2017/03/r22_ipc_62.pdf - Engineering bibliographies - in Harvard style

In-text: (Diseño conceptual y cálculo aerodinámico de una pala para un helicóptero monoplaza, 2010)

Your Bibliography: 2010. Diseño conceptual y cálculo aerodinámico de una pala para un helicóptero monoplaza. [ebook] México D.F: Instituto Politécnico Nacional, p.31. Available at: <http://www.repositoriodigital.ipn.mx/bitstream/123456789/8043/1/TESINA-AERO-005.pdf> [Accessed 14 May 2018].

In-text: (NACA 63-015A AIRFOIL (n63015a-il), 2018)

Your Bibliography: Airfoiltools.com. 2018. NACA 63-015A AIRFOIL (n63015a-il). [online] Available at: <http://airfoiltools.com/airfoil/details?airfoil=n63015a-il> [Accessed 15 May 2018].

In-text: (Cruz, Oropeza and Vigueras, 2011)

Your Bibliography: Cruz, F., Oropeza, R. and Vigueras, R., 2011. Análisis Aerodinámico de una pala del rotor principal de un helicóptero experimental. México D.F: Instituto Politécnico Nacional, pp.17-20.

In-text: (R22 Introduction & Specifications - Robinson Helicopter Company, 2018)

Your Bibliography: Robinson Helicopter Company. 2018. R22 Introduction & Specifications - Robinson Helicopter Company. [online] Available at: <https://robinsonheli.com/r22-specifications/> [Accessed 12 May 2018].

In-text: (2018)

Your Bibliography: Robinsonheli.com. 2018. [online] Available at: <https://robinsonheli.com/wp-content/uploads/2017/03/r22_ipc_62.pdf> [Accessed 12 May 2018].

In-text: (Vu, Lee and Shu, 2013)

Your Bibliography: Vu, N., Lee, J. and Shu, J., 2013. Aerodynamic design optimization of helicopter rotor blades including airfoil shape for hover performance. Chinese Journal of Aeronautics, 26(1), pp.1-8.

In-text: (skytechnologies.net, 2018)

Your Bibliography: Ww38.skytechnologies.net. 2018. skytechnologies.net. [online] Available at: <http://ww38.skytechnologies.net/home.html> [Accessed 15 May 2018].