What is Systems Engineering and it's importance - Engineering bibliographies - in Harvard style

In-text: (http://www.zarr.com, 2015)

Your Bibliography: http://www.zarr.com, W., 2015. Benefits of Systems Engineering – Systems Engineering Benefits. [online] Burgehugheswalsh.co.uk. Available at: <http://www.burgehugheswalsh.co.uk/Systems-Engineering/Benefits.aspx> [Accessed 3 February 2015].

In-text: (https://incoseonline.org.uk, 2009)

Your Bibliography: https://incoseonline.org.uk, W., 2009. What is systems engineering ? Creating succesful systems. [online] UK Chapter, International Council on Systems Engineering. Available at: <https://incoseonline.org.uk/Documents/zGuides/Z1_What_is_SE.pdf> [Accessed 2 February 2015].

In-text: (Kossiakoff, Sweet and Seymour, 2011)

Your Bibliography: Kossiakoff, A., Sweet, W. and Seymour, S., 2011. Systems Engineering Principles and Practice. Hoboken: John Wiley & Sons, pp.31-34.

In-text: (NASA Technical Reports Server, 2007)

Your Bibliography: NASA Technical Reports Server, N., 2007. NASA Systems Engineering Handbook. Washington, DC.: NASA Scientific and Technical Information Program.

In-text: (Schlager, 1956)

Your Bibliography: Schlager, K., 1956. Systems engineering-key to modern development. IRE Transactions on Engineering Management, EM-3(3), pp.64-66.