As he says that..

As Ballard (2017) states that nicotine is more dangerous than alcohol.

OK so there is a group of reporting verbs that may be followed by that (+ independent clause), while there are others that don’t work with that:

Reporting verbs with ‘that’

  • Henderson (2013) writes that the double quantum matrix is a myth.
  • In 2015 it was discovered by Smith that elephants are more afraid of snakes than mice.
  • The findings of Jones et al. (2017) suggest that music education can lead to more general improvements in academic ability.

Reporting verbs without ‘that’

  • Henderson (2013) describes the double quantum matrix as a myth.
  • In his 2015 study of elephants, Smith identified a discrepancy between fear of mice and fear of snakes.
  • Jones’ research (2017) highlighted improvements in academic ability following music study.

As + that (?!)

This third category simply does not exist! As does not belong with that, so in our opening example we need either:

  • Ballard (2017) states that nicotine is more dangerous than alcohol.

OR..

  • As Ballard (2017) states, nicotine is more dangerous than alcohol.

Indonesian flag But NEVER:

  • As Ballard (2017) states that nicotine is more dangerous than alcohol.

It is called as ‘bad grammar’

People call this as the ‘big data era’.

Indonesian flag In Bahasa Indonesia disebut (called) collocates strongly with sebagai (as). Not so in English. Indeed, sebagai is often redundant in English, except when it collocates with certain verbs.

The correct options here are:

  1. People call this the ‘big data era’. (active call without as)
  2. This era is called the ‘big data era’. (passive call without as)
  3. This era is known as the ‘big data era’. (passive know with as)

Most native speakers would probably use number 1, except when the term being introduced is somehow scientific:

  • Liquids tend to travel quickly along very narrow spaces. This phenomenon is known as capillary attraction.

Be careful. If you want to use known as then you need to begin with some of the defining characteristics of the ‘known’ phenomenon:

  • Recently data has become so complex that traditional data processing application software is inadequate to deal with it. This data is now known as ‘big data’.

Indonesian flag Indonesians.. Once again, be careful with sebagai! It collocates differently in English.