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Armstrong, Karen (1992). Muhammad: A Biography of the Prophet. Harper Collins, New York, USA
Armstrong, Karen (2002). Islam: A Short History. Harper Collins, New York, USA
Armstrong, Karen (2007). Muhammad: A Prophet for our Time. Harper Collins, New York, USA
Saheeh Int. (2004). The Qur’an English Meanings. Abul-Qassim Publishing, Al Muntada Al-Islami-Jeddah, KSA
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Electronic sources

www.sciencekids.co.nz/

http://training.seer.cancer.gov/anatomy/reproductive/

http://www.msdmanuals.com/home/women-s-health-issues/normal-pregnancy/

stages-of-development-of-the-fetus

www.worldstory.net/en/species.html

http://animals.howstuffworks.com/insects/housefly.htm

http://corpus.quran.com/translation.jsp?chapter=55&verse=60

www.bibleinfo.com/en/questions/who-wrote-the-bible

www.gotquestions.org/Bible-authors.html

www.jba.gr/the-author-of-the-Bible.html

www.biblica.com/en-us/bible/bible-faqs/who-wrote-the-bible/

www.everystudent.com/features/faith.html

www.religioustolerance.org/chr_oldt.html

www.myjewishlearning.com/article/bible/

www.christianteens.about.com/od/understandingyourbible/p/StructureOldTes.html

www.epd.gov.hk/epd/noise_education/web/ENG_EPD_HTML/m1/intro_5.html